diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index ad41e81..5d3ea1b 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -32,6 +32,8 @@
         "diff": "^8.0.2",
         "lucide-react": "^0.552.0",
         "marked": "^16.4.1",
+        "mermaid": "^11.12.2",
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         "prosemirror-changeset": "^2.3.1",
         "prosemirror-commands": "^1.7.1",
         "prosemirror-history": "^1.4.1",
@@ -48,6 +50,7 @@
         "react-dom": "^19.1.1",
         "react-markdown": "^10.1.0",
         "react-resizable-panels": "^3.0.6",
+        "recharts": "^3.6.0",
         "remark-breaks": "^4.0.0",
         "remark-gfm": "^4.0.1",
         "shiki": "^3.14.0",
@@ -67,6 +70,7 @@
         "@testing-library/react": "^16.3.0",
         "@types/markdown-it": "^14.1.2",
         "@types/node": "^24.5.2",
+        "@types/papaparse": "^5.5.2",
         "@types/react": "^19.1.13",
         "@types/react-dom": "^19.1.9",
         "@vitejs/plugin-react": "^4.7.0",
@@ -109,6 +113,19 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/@antfu/install-pkg": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@antfu/install-pkg/-/install-pkg-1.1.0.tgz",
+      "integrity": "sha512-MGQsmw10ZyI+EJo45CdSER4zEb+p31LpDAFp2Z3gkSd1yqVZGi0Ebx++YTEMonJy4oChEMLsxZ64j8FH6sSqtQ==",
+      "license": "MIT",
+      "dependencies": {
+        "package-manager-detector": "^1.3.0",
+        "tinyexec": "^1.0.1"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/antfu"
+      }
+    },
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       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-4.1.0.tgz",
@@ -437,6 +454,63 @@
         "node": ">=6.9.0"
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+    "node_modules/@braintree/sanitize-url": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/@braintree/sanitize-url/-/sanitize-url-7.1.1.tgz",
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+      "license": "MIT"
+    },
+    "node_modules/@chevrotain/cst-dts-gen": {
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+      "resolved": "https://registry.npmjs.org/@chevrotain/cst-dts-gen/-/cst-dts-gen-11.0.3.tgz",
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+      "license": "Apache-2.0",
+      "dependencies": {
+        "@chevrotain/gast": "11.0.3",
+        "@chevrotain/types": "11.0.3",
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+    "node_modules/@chevrotain/cst-dts-gen/node_modules/lodash-es": {
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+      "resolved": "https://registry.npmjs.org/lodash-es/-/lodash-es-4.17.21.tgz",
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+      "license": "MIT"
+    },
+    "node_modules/@chevrotain/gast": {
+      "version": "11.0.3",
+      "resolved": "https://registry.npmjs.org/@chevrotain/gast/-/gast-11.0.3.tgz",
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+      "license": "Apache-2.0",
+      "dependencies": {
+        "@chevrotain/types": "11.0.3",
+        "lodash-es": "4.17.21"
+      }
+    },
+    "node_modules/@chevrotain/gast/node_modules/lodash-es": {
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+      "resolved": "https://registry.npmjs.org/lodash-es/-/lodash-es-4.17.21.tgz",
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+      "license": "MIT"
+    },
+    "node_modules/@chevrotain/regexp-to-ast": {
+      "version": "11.0.3",
+      "resolved": "https://registry.npmjs.org/@chevrotain/regexp-to-ast/-/regexp-to-ast-11.0.3.tgz",
+      "integrity": "sha512-1fMHaBZxLFvWI067AVbGJav1eRY7N8DDvYCTwGBiE/ytKBgP8azTdgyrKyWZ9Mfh09eHWb5PgTSO8wi7U824RA==",
+      "license": "Apache-2.0"
+    },
+    "node_modules/@chevrotain/types": {
+      "version": "11.0.3",
+      "resolved": "https://registry.npmjs.org/@chevrotain/types/-/types-11.0.3.tgz",
+      "integrity": "sha512-gsiM3G8b58kZC2HaWR50gu6Y1440cHiJ+i3JUvcp/35JchYejb2+5MVeJK0iKThYpAa/P2PYFV4hoi44HD+aHQ==",
+      "license": "Apache-2.0"
+    },
+    "node_modules/@chevrotain/utils": {
+      "version": "11.0.3",
+      "resolved": "https://registry.npmjs.org/@chevrotain/utils/-/utils-11.0.3.tgz",
+      "integrity": "sha512-YslZMgtJUyuMbZ+aKvfF3x1f5liK4mWNxghFRv7jqRR9C3R3fAOGTTKvxXDa2Y1s9zSbcpuO0cAxDYsc9SrXoQ==",
+      "license": "Apache-2.0"
+    },
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       "resolved": "https://registry.npmjs.org/@codemirror/autocomplete/-/autocomplete-6.20.0.tgz",
@@ -1432,6 +1506,23 @@
         "url": "https://github.com/sponsors/nzakas"
       }
     },
+    "node_modules/@iconify/types": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@iconify/types/-/types-2.0.0.tgz",
+      "integrity": "sha512-+wluvCrRhXrhyOmRDJ3q8mux9JkKy5SJ/v8ol2tu4FVjyYvtEzkc/3pK15ET6RKg4b4w4BmTk1+gsCUhf21Ykg==",
+      "license": "MIT"
+    },
+    "node_modules/@iconify/utils": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/@iconify/utils/-/utils-3.1.0.tgz",
+      "integrity": "sha512-Zlzem1ZXhI1iHeeERabLNzBHdOa4VhQbqAcOQaMKuTuyZCpwKbC2R4Dd0Zo3g9EAc+Y4fiarO8HIHRAth7+skw==",
+      "license": "MIT",
+      "dependencies": {
+        "@antfu/install-pkg": "^1.1.0",
+        "@iconify/types": "^2.0.0",
+        "mlly": "^1.8.0"
+      }
+    },
     "node_modules/@isaacs/cliui": {
       "version": "8.0.2",
       "resolved": "https://registry.npmjs.org/@isaacs/cliui/-/cliui-8.0.2.tgz",
@@ -1562,6 +1653,15 @@
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       "license": "MIT"
     },
+    "node_modules/@mermaid-js/parser": {
+      "version": "0.6.3",
+      "resolved": "https://registry.npmjs.org/@mermaid-js/parser/-/parser-0.6.3.tgz",
+      "integrity": "sha512-lnjOhe7zyHjc+If7yT4zoedx2vo4sHaTmtkl1+or8BRTnCtDmcTpAjpzDSfCZrshM5bCoz0GyidzadJAH1xobA==",
+      "license": "MIT",
+      "dependencies": {
+        "langium": "3.3.1"
+      }
+    },
     "node_modules/@nodelib/fs.scandir": {
       "version": "2.1.5",
       "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
@@ -2365,6 +2465,42 @@
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     },
+    "node_modules/@reduxjs/toolkit": {
+      "version": "2.11.2",
+      "resolved": "https://registry.npmjs.org/@reduxjs/toolkit/-/toolkit-2.11.2.tgz",
+      "integrity": "sha512-Kd6kAHTA6/nUpp8mySPqj3en3dm0tdMIgbttnQ1xFMVpufoj+ADi8pXLBsd4xzTRHQa7t/Jv8W5UnCuW4kuWMQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@standard-schema/spec": "^1.0.0",
+        "@standard-schema/utils": "^0.3.0",
+        "immer": "^11.0.0",
+        "redux": "^5.0.1",
+        "redux-thunk": "^3.1.0",
+        "reselect": "^5.1.0"
+      },
+      "peerDependencies": {
+        "react": "^16.9.0 || ^17.0.0 || ^18 || ^19",
+        "react-redux": "^7.2.1 || ^8.1.3 || ^9.0.0"
+      },
+      "peerDependenciesMeta": {
+        "react": {
+          "optional": true
+        },
+        "react-redux": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@reduxjs/toolkit/node_modules/immer": {
+      "version": "11.1.3",
+      "resolved": "https://registry.npmjs.org/immer/-/immer-11.1.3.tgz",
+      "integrity": "sha512-6jQTc5z0KJFtr1UgFpIL3N9XSC3saRaI9PwWtzM2pSqkNGtiNkYY2OSwkOGDK2XcTRcLb1pi/aNkKZz0nxVH4Q==",
+      "license": "MIT",
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/immer"
+      }
+    },
     "node_modules/@rolldown/pluginutils": {
       "version": "1.0.0-beta.27",
       "resolved": "https://registry.npmjs.org/@rolldown/pluginutils/-/pluginutils-1.0.0-beta.27.tgz",
@@ -2743,7 +2879,12 @@
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-      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@standard-schema/utils": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/@standard-schema/utils/-/utils-0.3.0.tgz",
+      "integrity": "sha512-e7Mew686owMaPJVNNLs55PUvgz371nKgwsc4vxE49zsODpJEnxgxRo2y/OKrqueavXgZNMDVj3DdHFlaSAeU8g==",
       "license": "MIT"
     },
     "node_modules/@testing-library/dom": {
@@ -2882,6 +3023,259 @@
         "assertion-error": "^2.0.1"
       }
     },
+    "node_modules/@types/d3": {
+      "version": "7.4.3",
+      "resolved": "https://registry.npmjs.org/@types/d3/-/d3-7.4.3.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "@types/d3-array": "*",
+        "@types/d3-axis": "*",
+        "@types/d3-brush": "*",
+        "@types/d3-chord": "*",
+        "@types/d3-color": "*",
+        "@types/d3-contour": "*",
+        "@types/d3-delaunay": "*",
+        "@types/d3-dispatch": "*",
+        "@types/d3-drag": "*",
+        "@types/d3-dsv": "*",
+        "@types/d3-ease": "*",
+        "@types/d3-fetch": "*",
+        "@types/d3-force": "*",
+        "@types/d3-format": "*",
+        "@types/d3-geo": "*",
+        "@types/d3-hierarchy": "*",
+        "@types/d3-interpolate": "*",
+        "@types/d3-path": "*",
+        "@types/d3-polygon": "*",
+        "@types/d3-quadtree": "*",
+        "@types/d3-random": "*",
+        "@types/d3-scale": "*",
+        "@types/d3-scale-chromatic": "*",
+        "@types/d3-selection": "*",
+        "@types/d3-shape": "*",
+        "@types/d3-time": "*",
+        "@types/d3-time-format": "*",
+        "@types/d3-timer": "*",
+        "@types/d3-transition": "*",
+        "@types/d3-zoom": "*"
+      }
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+        "www"
+      ],
+      "dependencies": {
+        "@reduxjs/toolkit": "1.x.x || 2.x.x",
+        "clsx": "^2.1.1",
+        "decimal.js-light": "^2.5.1",
+        "es-toolkit": "^1.39.3",
+        "eventemitter3": "^5.0.1",
+        "immer": "^10.1.1",
+        "react-redux": "8.x.x || 9.x.x",
+        "reselect": "5.1.1",
+        "tiny-invariant": "^1.3.3",
+        "use-sync-external-store": "^1.2.2",
+        "victory-vendor": "^37.0.2"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0",
+        "react-dom": "^16.0.0 || ^17.0.0 || ^18.0.0 || ^19.0.0",
+        "react-is": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0"
+      }
+    },
     "node_modules/redent": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/redent/-/redent-3.0.0.tgz",
@@ -7197,6 +8438,21 @@
         "node": ">=8"
       }
     },
+    "node_modules/redux": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/redux/-/redux-5.0.1.tgz",
+      "integrity": "sha512-M9/ELqF6fy8FwmkpnF0S3YKOqMyoWJ4+CS5Efg2ct3oY9daQvd/Pc71FpGZsVsbl3Cpb+IIcjBDUnnyBdQbq4w==",
+      "license": "MIT"
+    },
+    "node_modules/redux-thunk": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/redux-thunk/-/redux-thunk-3.1.0.tgz",
+      "integrity": "sha512-NW2r5T6ksUKXCabzhL9z+h206HQw/NJkcLm1GPImRQ8IzfXwRGqjVhKJGauHirT0DAuyy6hjdnMZaRoAcy0Klw==",
+      "license": "MIT",
+      "peerDependencies": {
+        "redux": "^5.0.0"
+      }
+    },
     "node_modules/regex": {
       "version": "6.0.1",
       "resolved": "https://registry.npmjs.org/regex/-/regex-6.0.1.tgz",
@@ -7304,6 +8560,12 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/reselect": {
+      "version": "5.1.1",
+      "resolved": "https://registry.npmjs.org/reselect/-/reselect-5.1.1.tgz",
+      "integrity": "sha512-K/BG6eIky/SBpzfHZv/dd+9JBFiS4SWV7FIujVyJRux6e45+73RaUHXLmIR1f7WOMaQ0U1km6qwklRQxpJJY0w==",
+      "license": "MIT"
+    },
     "node_modules/resolve": {
       "version": "1.22.11",
       "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.22.11.tgz",
@@ -7341,6 +8603,12 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/robust-predicates": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/robust-predicates/-/robust-predicates-3.0.2.tgz",
+      "integrity": "sha512-IXgzBWvWQwE6PrDI05OvmXUIruQTcoMDzRsOd5CDvHCVLcLHMTSYvOK5Cm46kWqlV3yAbuSpBZdJ5oP5OUoStg==",
+      "license": "Unlicense"
+    },
     "node_modules/rollup": {
       "version": "3.29.5",
       "resolved": "https://registry.npmjs.org/rollup/-/rollup-3.29.5.tgz",
@@ -7362,6 +8630,18 @@
       "resolved": "https://registry.npmjs.org/rope-sequence/-/rope-sequence-1.3.4.tgz",
       "integrity": "sha512-UT5EDe2cu2E/6O4igUr5PSFs23nvvukicWHx6GnOPlHAiiYbzNuCRQCuiUdHJQcqKalLKlrYJnjY0ySGsXNQXQ=="
     },
+    "node_modules/roughjs": {
+      "version": "4.6.6",
+      "resolved": "https://registry.npmjs.org/roughjs/-/roughjs-4.6.6.tgz",
+      "integrity": "sha512-ZUz/69+SYpFN/g/lUlo2FXcIjRkSu3nDarreVdGGndHEBJ6cXPdKguS8JGxwj5HA5xIbVKSmLgr5b3AWxtRfvQ==",
+      "license": "MIT",
+      "dependencies": {
+        "hachure-fill": "^0.5.2",
+        "path-data-parser": "^0.1.0",
+        "points-on-curve": "^0.2.0",
+        "points-on-path": "^0.2.1"
+      }
+    },
     "node_modules/run-parallel": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/run-parallel/-/run-parallel-1.2.0.tgz",
@@ -7384,11 +8664,16 @@
         "queue-microtask": "^1.2.2"
       }
     },
+    "node_modules/rw": {
+      "version": "1.3.3",
+      "resolved": "https://registry.npmjs.org/rw/-/rw-1.3.3.tgz",
+      "integrity": "sha512-PdhdWy89SiZogBLaw42zdeqtRJ//zFd2PgQavcICDUgJT5oW10QCRKbJ6bg4r0/UY2M6BWd5tkxuGFRvCkgfHQ==",
+      "license": "BSD-3-Clause"
+    },
     "node_modules/safer-buffer": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
       "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
-      "dev": true,
       "license": "MIT"
     },
     "node_modules/saxes": {
@@ -7658,6 +8943,12 @@
         "inline-style-parser": "0.2.6"
       }
     },
+    "node_modules/stylis": {
+      "version": "4.3.6",
+      "resolved": "https://registry.npmjs.org/stylis/-/stylis-4.3.6.tgz",
+      "integrity": "sha512-yQ3rwFWRfwNUY7H5vpU0wfdkNSnvnJinhF9830Swlaxl03zsOjCfmX0ugac+3LtK0lYSgwL/KXc8oYL3mG4YFQ==",
+      "license": "MIT"
+    },
     "node_modules/sucrase": {
       "version": "3.35.0",
       "resolved": "https://registry.npmjs.org/sucrase/-/sucrase-3.35.0.tgz",
@@ -7789,6 +9080,12 @@
         "node": ">=0.8"
       }
     },
+    "node_modules/tiny-invariant": {
+      "version": "1.3.3",
+      "resolved": "https://registry.npmjs.org/tiny-invariant/-/tiny-invariant-1.3.3.tgz",
+      "integrity": "sha512-+FbBPE1o9QAYvviau/qC5SE3caw21q3xkvWKBtja5vgqOWIHHJ3ioaq1VPfn/Szqctz2bU/oYeKd9/z5BL+PVg==",
+      "license": "MIT"
+    },
     "node_modules/tinybench": {
       "version": "2.9.0",
       "resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.9.0.tgz",
@@ -7800,7 +9097,6 @@
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-1.0.2.tgz",
       "integrity": "sha512-W/KYk+NFhkmsYpuHq5JykngiOCnxeVL8v8dFnqxSD8qEEdRfXk1SDM6JzNqcERbcGYj9tMrDQBYV9cjgnunFIg==",
-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=18"
@@ -7951,6 +9247,15 @@
         "typescript": ">=4.8.4"
       }
     },
+    "node_modules/ts-dedent": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/ts-dedent/-/ts-dedent-2.2.0.tgz",
+      "integrity": "sha512-q5W7tVM71e2xjHZTlgfTDoPF/SmqKG5hddq9SzR49CH2hayqRKJtQ4mtRlSxKaJlR/+9rEM+mnBHf7I2/BQcpQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.10"
+      }
+    },
     "node_modules/ts-interface-checker": {
       "version": "0.1.13",
       "resolved": "https://registry.npmjs.org/ts-interface-checker/-/ts-interface-checker-0.1.13.tgz",
@@ -8014,6 +9319,12 @@
       "resolved": "https://registry.npmjs.org/uc.micro/-/uc.micro-2.1.0.tgz",
       "integrity": "sha512-ARDJmphmdvUk6Glw7y9DQ2bFkKBHwQHLi2lsaH6PPmz/Ka9sFOBsBluozhDltWmnv9u/cF6Rt87znRTPV+yp/A=="
     },
+    "node_modules/ufo": {
+      "version": "1.6.3",
+      "resolved": "https://registry.npmjs.org/ufo/-/ufo-1.6.3.tgz",
+      "integrity": "sha512-yDJTmhydvl5lJzBmy/hyOAA0d+aqCBuwl818haVdYCRrWV84o7YyeVm4QlVHStqNrrJSTb6jKuFAVqAFsr+K3Q==",
+      "license": "MIT"
+    },
     "node_modules/undici-types": {
       "version": "7.12.0",
       "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.12.0.tgz",
@@ -8202,6 +9513,19 @@
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
       "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw=="
     },
+    "node_modules/uuid": {
+      "version": "11.1.0",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-11.1.0.tgz",
+      "integrity": "sha512-0/A9rDy9P7cJ+8w1c9WD9V//9Wj15Ce2MPz8Ri6032usz+NfePxx5AcN3bN+r6ZL6jEo066/yNYB3tn4pQEx+A==",
+      "funding": [
+        "https://github.com/sponsors/broofa",
+        "https://github.com/sponsors/ctavan"
+      ],
+      "license": "MIT",
+      "bin": {
+        "uuid": "dist/esm/bin/uuid"
+      }
+    },
     "node_modules/vfile": {
       "version": "6.0.3",
       "resolved": "https://registry.npmjs.org/vfile/-/vfile-6.0.3.tgz",
@@ -8228,6 +9552,28 @@
         "url": "https://opencollective.com/unified"
       }
     },
+    "node_modules/victory-vendor": {
+      "version": "37.3.6",
+      "resolved": "https://registry.npmjs.org/victory-vendor/-/victory-vendor-37.3.6.tgz",
+      "integrity": "sha512-SbPDPdDBYp+5MJHhBCAyI7wKM3d5ivekigc2Dk2s7pgbZ9wIgIBYGVw4zGHBml/qTFbexrofXW6Gu4noGxrOwQ==",
+      "license": "MIT AND ISC",
+      "dependencies": {
+        "@types/d3-array": "^3.0.3",
+        "@types/d3-ease": "^3.0.0",
+        "@types/d3-interpolate": "^3.0.1",
+        "@types/d3-scale": "^4.0.2",
+        "@types/d3-shape": "^3.1.0",
+        "@types/d3-time": "^3.0.0",
+        "@types/d3-timer": "^3.0.0",
+        "d3-array": "^3.1.6",
+        "d3-ease": "^3.0.1",
+        "d3-interpolate": "^3.0.1",
+        "d3-scale": "^4.0.2",
+        "d3-shape": "^3.1.0",
+        "d3-time": "^3.0.0",
+        "d3-timer": "^3.0.1"
+      }
+    },
     "node_modules/vite": {
       "version": "4.5.14",
       "resolved": "https://registry.npmjs.org/vite/-/vite-4.5.14.tgz",
@@ -8952,6 +10298,55 @@
         }
       }
     },
+    "node_modules/vscode-jsonrpc": {
+      "version": "8.2.0",
+      "resolved": "https://registry.npmjs.org/vscode-jsonrpc/-/vscode-jsonrpc-8.2.0.tgz",
+      "integrity": "sha512-C+r0eKJUIfiDIfwJhria30+TYWPtuHJXHtI7J0YlOmKAo7ogxP20T0zxB7HZQIFhIyvoBPwWskjxrvAtfjyZfA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
+    "node_modules/vscode-languageserver": {
+      "version": "9.0.1",
+      "resolved": "https://registry.npmjs.org/vscode-languageserver/-/vscode-languageserver-9.0.1.tgz",
+      "integrity": "sha512-woByF3PDpkHFUreUa7Hos7+pUWdeWMXRd26+ZX2A8cFx6v/JPTtd4/uN0/jB6XQHYaOlHbio03NTHCqrgG5n7g==",
+      "license": "MIT",
+      "dependencies": {
+        "vscode-languageserver-protocol": "3.17.5"
+      },
+      "bin": {
+        "installServerIntoExtension": "bin/installServerIntoExtension"
+      }
+    },
+    "node_modules/vscode-languageserver-protocol": {
+      "version": "3.17.5",
+      "resolved": "https://registry.npmjs.org/vscode-languageserver-protocol/-/vscode-languageserver-protocol-3.17.5.tgz",
+      "integrity": "sha512-mb1bvRJN8SVznADSGWM9u/b07H7Ecg0I3OgXDuLdn307rl/J3A9YD6/eYOssqhecL27hK1IPZAsaqh00i/Jljg==",
+      "license": "MIT",
+      "dependencies": {
+        "vscode-jsonrpc": "8.2.0",
+        "vscode-languageserver-types": "3.17.5"
+      }
+    },
+    "node_modules/vscode-languageserver-textdocument": {
+      "version": "1.0.12",
+      "resolved": "https://registry.npmjs.org/vscode-languageserver-textdocument/-/vscode-languageserver-textdocument-1.0.12.tgz",
+      "integrity": "sha512-cxWNPesCnQCcMPeenjKKsOCKQZ/L6Tv19DTRIGuLWe32lyzWhihGVJ/rcckZXJxfdKCFvRLS3fpBIsV/ZGX4zA==",
+      "license": "MIT"
+    },
+    "node_modules/vscode-languageserver-types": {
+      "version": "3.17.5",
+      "resolved": "https://registry.npmjs.org/vscode-languageserver-types/-/vscode-languageserver-types-3.17.5.tgz",
+      "integrity": "sha512-Ld1VelNuX9pdF39h2Hgaeb5hEZM2Z3jUrrMgWQAu82jMtZp7p3vJT3BzToKtZI7NgQssZje5o0zryOrhQvzQAg==",
+      "license": "MIT"
+    },
+    "node_modules/vscode-uri": {
+      "version": "3.0.8",
+      "resolved": "https://registry.npmjs.org/vscode-uri/-/vscode-uri-3.0.8.tgz",
+      "integrity": "sha512-AyFQ0EVmsOZOlAnxoFOGOq1SQDWAB7C6aqMGS23svWAllfOaxbuFvcT8D1i8z3Gyn8fraVeZNNmN6e9bxxXkKw==",
+      "license": "MIT"
+    },
     "node_modules/w3c-keyname": {
       "version": "2.2.8",
       "resolved": "https://registry.npmjs.org/w3c-keyname/-/w3c-keyname-2.2.8.tgz",
diff --git a/frontend/package.json b/frontend/package.json
index cbe0fcf..4d5bedc 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -38,6 +38,8 @@
     "diff": "^8.0.2",
     "lucide-react": "^0.552.0",
     "marked": "^16.4.1",
+    "mermaid": "^11.12.2",
+    "papaparse": "^5.5.3",
     "prosemirror-changeset": "^2.3.1",
     "prosemirror-commands": "^1.7.1",
     "prosemirror-history": "^1.4.1",
@@ -54,6 +56,7 @@
     "react-dom": "^19.1.1",
     "react-markdown": "^10.1.0",
     "react-resizable-panels": "^3.0.6",
+    "recharts": "^3.6.0",
     "remark-breaks": "^4.0.0",
     "remark-gfm": "^4.0.1",
     "shiki": "^3.14.0",
@@ -73,6 +76,7 @@
     "@testing-library/react": "^16.3.0",
     "@types/markdown-it": "^14.1.2",
     "@types/node": "^24.5.2",
+    "@types/papaparse": "^5.5.2",
     "@types/react": "^19.1.13",
     "@types/react-dom": "^19.1.9",
     "@vitejs/plugin-react": "^4.7.0",
diff --git a/frontend/src/components/editor/CollaborativeEditor.tsx b/frontend/src/components/editor/CollaborativeEditor.tsx
index 7acb677..5f0e839 100644
--- a/frontend/src/components/editor/CollaborativeEditor.tsx
+++ b/frontend/src/components/editor/CollaborativeEditor.tsx
@@ -26,6 +26,7 @@ import { uploadImage, isImageFile } from '../../services/upload-api';
 import { useAuth } from '../../contexts/AuthContext';
 import { EditorToolbar } from './EditorToolbar';
 import { useWikiLinks } from '../../hooks/useWikiLinks';
+import { createNodeViews } from '../../editor/nodeViews';
 
 import './prosemirror.css';
 
@@ -439,6 +440,7 @@ export const CollaborativeEditor: React.FC<CollaborativeEditorProps> = ({
       view = new EditorView(editorRef.current, {
         state,
         editable: () => editableRef.current,
+        nodeViews: createNodeViews(pagePath),
       });
 
       viewRef.current = view;
diff --git a/frontend/src/components/editor/ProseMirrorEditor.tsx b/frontend/src/components/editor/ProseMirrorEditor.tsx
index 699fa9c..1452b57 100644
--- a/frontend/src/components/editor/ProseMirrorEditor.tsx
+++ b/frontend/src/components/editor/ProseMirrorEditor.tsx
@@ -10,6 +10,7 @@ import { schema, setCurrentPagePath } from '../../editor/schema';
 import { markdownToProseMirror, prosemirrorToMarkdown } from '../../editor/conversion';
 import { buildKeymap } from '../../editor/keymap';
 import { useWikiLinks } from '../../hooks/useWikiLinks';
+import { createNodeViews } from '../../editor/nodeViews';
 import './prosemirror.css';
 
 interface ProseMirrorEditorProps {
@@ -85,6 +86,7 @@ export const ProseMirrorEditor = forwardRef<ProseMirrorEditorHandle, ProseMirror
       const view = new EditorView(editorRef.current, {
         state,
         editable: () => editable,
+        nodeViews: createNodeViews(pagePath || null),
         dispatchTransaction(transaction: Transaction) {
           const newState = view.state.apply(transaction);
           view.updateState(newState);
diff --git a/frontend/src/components/visualizations/ChartViewer.tsx b/frontend/src/components/visualizations/ChartViewer.tsx
new file mode 100644
index 0000000..2ec1463
--- /dev/null
+++ b/frontend/src/components/visualizations/ChartViewer.tsx
@@ -0,0 +1,188 @@
+import { useMemo } from 'react';
+import Papa from 'papaparse';
+import {
+  LineChart,
+  BarChart,
+  PieChart,
+  AreaChart,
+  Line,
+  Bar,
+  Pie,
+  Area,
+  XAxis,
+  YAxis,
+  CartesianGrid,
+  Tooltip,
+  Legend,
+  ResponsiveContainer,
+  Cell,
+} from 'recharts';
+
+export type ChartType = 'line' | 'bar' | 'pie' | 'area';
+
+interface ChartViewerProps {
+  csvData: string;
+  chartType?: ChartType;
+  title?: string;
+}
+
+const COLORS = [
+  'hsl(var(--primary))',
+  'hsl(var(--secondary))',
+  'hsl(var(--accent))',
+  '#8884d8',
+  '#82ca9d',
+  '#ffc658',
+  '#ff7c7c',
+  '#a28dff',
+];
+
+function parseCSV(csv: string): Array<Record<string, any>> {
+  // Use papaparse for proper CSV parsing (handles quotes, escapes, etc.)
+  const result = Papa.parse(csv.trim(), {
+    header: true,
+    skipEmptyLines: true,
+    dynamicTyping: true, // Auto-converts numbers
+    transform: (value) => {
+      // Handle empty strings - keep as string instead of converting to 0
+      const trimmed = value.trim();
+      if (trimmed === '') return trimmed;
+
+      // Try to parse as number, otherwise keep as string
+      const num = Number(trimmed);
+      return trimmed !== '' && !isNaN(num) ? num : trimmed;
+    },
+  });
+
+  if (result.errors.length > 0) {
+    console.error('CSV parsing errors:', result.errors);
+  }
+
+  return result.data as Array<Record<string, any>>;
+}
+
+function detectChartType(data: Array<Record<string, any>>): ChartType {
+  if (data.length === 0) return 'bar';
+
+  const keys = Object.keys(data[0]);
+  const numericKeys = keys.filter((key) => typeof data[0][key] === 'number');
+
+  // If only one numeric column and few rows, suggest pie chart
+  if (numericKeys.length === 1 && data.length <= 10) {
+    return 'pie';
+  }
+
+  // Default to line chart for time series data
+  return 'line';
+}
+
+export function ChartViewer({ csvData, chartType, title }: ChartViewerProps) {
+  const data = useMemo(() => parseCSV(csvData), [csvData]);
+
+  const detectedChartType = chartType || detectChartType(data);
+
+  if (data.length === 0) {
+    return (
+      <div className="flex items-center justify-center h-64 border rounded-md bg-muted/10">
+        <p className="text-muted-foreground">No data to display</p>
+      </div>
+    );
+  }
+
+  const keys = Object.keys(data[0]);
+  const xKey = keys[0]; // First column is X-axis
+  const dataKeys = keys.slice(1).filter((key) => typeof data[0][key] === 'number');
+
+  const renderChart = () => {
+    switch (detectedChartType) {
+      case 'line':
+        return (
+          <LineChart data={data}>
+            <CartesianGrid strokeDasharray="3 3" />
+            <XAxis dataKey={xKey} />
+            <YAxis />
+            <Tooltip />
+            <Legend />
+            {dataKeys.map((key, index) => (
+              <Line
+                key={key}
+                type="monotone"
+                dataKey={key}
+                stroke={COLORS[index % COLORS.length]}
+                strokeWidth={2}
+              />
+            ))}
+          </LineChart>
+        );
+
+      case 'bar':
+        return (
+          <BarChart data={data}>
+            <CartesianGrid strokeDasharray="3 3" />
+            <XAxis dataKey={xKey} />
+            <YAxis />
+            <Tooltip />
+            <Legend />
+            {dataKeys.map((key, index) => (
+              <Bar key={key} dataKey={key} fill={COLORS[index % COLORS.length]} />
+            ))}
+          </BarChart>
+        );
+
+      case 'area':
+        return (
+          <AreaChart data={data}>
+            <CartesianGrid strokeDasharray="3 3" />
+            <XAxis dataKey={xKey} />
+            <YAxis />
+            <Tooltip />
+            <Legend />
+            {dataKeys.map((key, index) => (
+              <Area
+                key={key}
+                type="monotone"
+                dataKey={key}
+                fill={COLORS[index % COLORS.length]}
+                stroke={COLORS[index % COLORS.length]}
+              />
+            ))}
+          </AreaChart>
+        );
+
+      case 'pie':
+        // For pie charts, use the first numeric column
+        const pieDataKey = dataKeys[0];
+        return (
+          <PieChart>
+            <Pie
+              data={data}
+              dataKey={pieDataKey}
+              nameKey={xKey}
+              cx="50%"
+              cy="50%"
+              outerRadius={80}
+              label
+            >
+              {data.map((_entry, index) => (
+                <Cell key={`cell-${index}`} fill={COLORS[index % COLORS.length]} />
+              ))}
+            </Pie>
+            <Tooltip />
+            <Legend />
+          </PieChart>
+        );
+
+      default:
+        return null;
+    }
+  };
+
+  return (
+    <div className="w-full my-4">
+      {title && <h3 className="text-lg font-semibold mb-2">{title}</h3>}
+      <ResponsiveContainer width="100%" height={400}>
+        {renderChart()}
+      </ResponsiveContainer>
+    </div>
+  );
+}
diff --git a/frontend/src/components/visualizations/MermaidDiagram.tsx b/frontend/src/components/visualizations/MermaidDiagram.tsx
new file mode 100644
index 0000000..5642682
--- /dev/null
+++ b/frontend/src/components/visualizations/MermaidDiagram.tsx
@@ -0,0 +1,59 @@
+import { useEffect, useRef, useState } from 'react';
+import mermaid from 'mermaid';
+
+interface MermaidDiagramProps {
+  chart: string;
+}
+
+// Initialize mermaid once
+mermaid.initialize({
+  startOnLoad: false,
+  theme: 'default',
+  securityLevel: 'strict',
+  fontFamily: 'inherit',
+});
+
+export function MermaidDiagram({ chart }: MermaidDiagramProps) {
+  const containerRef = useRef<HTMLDivElement>(null);
+  const [error, setError] = useState<string | null>(null);
+  const [id] = useState(() => `mermaid-${Math.random().toString(36).substring(2, 11)}`);
+
+  useEffect(() => {
+    const renderDiagram = async () => {
+      if (!containerRef.current || !chart.trim()) return;
+
+      try {
+        setError(null);
+        // Clear previous content
+        containerRef.current.innerHTML = '';
+
+        // Render the diagram
+        const { svg } = await mermaid.render(id, chart.trim());
+        containerRef.current.innerHTML = svg;
+      } catch (err) {
+        console.error('Mermaid rendering error:', err);
+        setError(err instanceof Error ? err.message : 'Failed to render diagram');
+      }
+    };
+
+    renderDiagram();
+  }, [chart, id]);
+
+  if (error) {
+    return (
+      <div className="border border-destructive rounded-md p-4 my-4 bg-destructive/10">
+        <p className="text-sm text-destructive">
+          <strong>Mermaid Error:</strong> {error}
+        </p>
+        <pre className="mt-2 text-xs overflow-x-auto">{chart}</pre>
+      </div>
+    );
+  }
+
+  return (
+    <div
+      ref={containerRef}
+      className="mermaid-container flex justify-center items-center my-4 p-4 bg-muted/10 rounded-md overflow-x-auto"
+    />
+  );
+}
diff --git a/frontend/src/editor/conversion.ts b/frontend/src/editor/conversion.ts
index 9d10c32..68bf8f1 100644
--- a/frontend/src/editor/conversion.ts
+++ b/frontend/src/editor/conversion.ts
@@ -32,15 +32,35 @@ export const markdownParser = new MarkdownParser(
     ...defaultMarkdownParser.tokens,
     // Ensure inline code is handled
     code_inline: { mark: 'code' },
-    // Image token
+    // Image token - check for chart references
     image: {
       node: 'image',
       // eslint-disable-next-line @typescript-eslint/no-explicit-any
-      getAttrs: (tok: any) => ({
-        src: tok.attrGet('src'),
-        alt: tok.children?.[0]?.content || null,
-        title: tok.attrGet('title'),
-      }),
+      getAttrs: (tok: any) => {
+        const src = tok.attrGet('src');
+        // Check if this is a chart reference (ends with .chart.csv or similar)
+        if (src && src.match(/\.chart\.(csv|json)$/)) {
+          return null; // Will be handled by special chart parser below
+        }
+        return {
+          src: tok.attrGet('src'),
+          alt: tok.children?.[0]?.content || null,
+          title: tok.attrGet('title'),
+        };
+      },
+    },
+    // Code fence - check for mermaid
+    fence: {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      node: 'code_block',
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      getAttrs: (tok: any) => {
+        const info = tok.info || '';
+        if (info.trim() === 'mermaid') {
+          return null; // Will be handled by mermaid parser below
+        }
+        return { params: info };
+      },
     },
     // Table tokens - cells need special handling to wrap content in paragraphs
     table: { block: 'table' },
@@ -183,16 +203,103 @@ export const markdownSerializer = new MarkdownSerializer(
     table_row() {},
     table_header() {},
     table_cell() {},
+    // Mermaid diagram serialization
+    mermaid(state, node) {
+      state.write('```mermaid\n');
+      state.write(node.attrs.content);
+      state.write('\n```');
+      state.closeBlock(node);
+    },
+    // Chart reference serialization
+    chart(state, node) {
+      const alt = node.attrs.chartType || '';
+      state.write(`![${alt}](${node.attrs.src})`);
+      state.closeBlock(node);
+    },
   },
   defaultMarkdownSerializer.marks
 );
 
+/**
+ * Pre-process markdown to extract mermaid and chart blocks
+ */
+function preprocessMarkdown(markdown: string): { markdown: string; special: Array<{ type: 'mermaid' | 'chart'; data: any; placeholder: string }> } {
+  const special: Array<{ type: 'mermaid' | 'chart'; data: any; placeholder: string }> = [];
+  let processed = markdown;
+
+  // Extract mermaid blocks using matchAll to avoid regex state issues
+  const mermaidRegex = /```mermaid\n([\s\S]*?)```/g;
+  const mermaidMatches = Array.from(markdown.matchAll(mermaidRegex));
+  mermaidMatches.forEach((match, index) => {
+    const placeholder = `__MERMAID_${index}__`;
+    special.push({
+      type: 'mermaid',
+      data: { content: match[1].trim() },
+      placeholder,
+    });
+    processed = processed.replace(match[0], placeholder);
+  });
+
+  // Extract chart references using matchAll
+  const chartRegex = /!\[([^\]]*)\]\(([^)]*\.chart\.(csv|json))\)/g;
+  const chartMatches = Array.from(markdown.matchAll(chartRegex));
+  chartMatches.forEach((match, index) => {
+    const placeholder = `__CHART_${index}__`;
+    const chartType = match[1].trim() || null; // Alt text can specify chart type
+    special.push({
+      type: 'chart',
+      data: { src: match[2], chartType },
+      placeholder,
+    });
+    processed = processed.replace(match[0], placeholder);
+  });
+
+  return { markdown: processed, special };
+}
+
 /**
  * Convert markdown string to ProseMirror document
  */
 export function markdownToProseMirror(markdown: string): ProseMirrorNode {
   try {
-    return markdownParser.parse(markdown) || schema.node('doc', null, [schema.node('paragraph')]);
+    // Pre-process to extract special blocks
+    const { markdown: processed, special } = preprocessMarkdown(markdown);
+
+    // Parse the processed markdown
+    let doc = markdownParser.parse(processed) || schema.node('doc', null, [schema.node('paragraph')]);
+
+    // Replace placeholders with actual nodes
+    if (special.length > 0) {
+      const newContent: ProseMirrorNode[] = [];
+
+      doc.forEach((node) => {
+        // Check if this node's textContent exactly matches a placeholder (entire paragraph)
+        const textContent = node.textContent.trim();
+        let replaced = false;
+
+        for (const item of special) {
+          if (textContent === item.placeholder) {
+            replaced = true;
+            if (item.type === 'mermaid') {
+              newContent.push(schema.node('mermaid', item.data));
+            } else if (item.type === 'chart') {
+              newContent.push(schema.node('chart', item.data));
+            }
+            break;
+          }
+        }
+
+        if (!replaced) {
+          newContent.push(node);
+        }
+      });
+
+      if (newContent.length > 0) {
+        doc = schema.node('doc', null, newContent);
+      }
+    }
+
+    return doc;
   } catch (error) {
     console.error('Error parsing markdown:', error);
     // Return empty document on error
diff --git a/frontend/src/editor/nodeViews.tsx b/frontend/src/editor/nodeViews.tsx
new file mode 100644
index 0000000..a6c98d9
--- /dev/null
+++ b/frontend/src/editor/nodeViews.tsx
@@ -0,0 +1,176 @@
+import { Node as ProseMirrorNode } from 'prosemirror-model';
+import { EditorView } from 'prosemirror-view';
+import type { NodeView } from 'prosemirror-view';
+import { createRoot } from 'react-dom/client';
+import type { Root } from 'react-dom/client';
+import { MermaidDiagram } from '../components/visualizations/MermaidDiagram';
+import { ChartViewer } from '../components/visualizations/ChartViewer';
+import type { ChartType } from '../components/visualizations/ChartViewer';
+import { getApiUrl, resolvePath } from '../utils/url';
+
+/**
+ * Helper to fetch CSV data from the wiki with abort support
+ */
+async function fetchCSVData(src: string, currentPagePath: string | null, signal?: AbortSignal): Promise<string> {
+  try {
+    // Resolve relative path
+    const resolvedPath = resolvePath(src, currentPagePath);
+    const url = `${getApiUrl()}/api/assets/${encodeURIComponent(resolvedPath).replace(/%2F/g, '/')}`;
+
+    const response = await fetch(url, { signal });
+    if (!response.ok) {
+      throw new Error(`Failed to fetch: ${response.statusText}`);
+    }
+
+    return await response.text();
+  } catch (error) {
+    // Don't log AbortError - it's expected when canceling requests
+    if (error instanceof Error && error.name === 'AbortError') {
+      throw error;
+    }
+    console.error('Error fetching CSV data:', error);
+    throw error;
+  }
+}
+
+/**
+ * Mermaid NodeView - renders Mermaid diagrams
+ */
+export class MermaidNodeView implements NodeView {
+  dom: HTMLElement;
+  private root: Root;
+
+  constructor(node: ProseMirrorNode) {
+    this.dom = document.createElement('div');
+    this.dom.className = 'mermaid-node-view';
+
+    // Create React root and render component
+    this.root = createRoot(this.dom);
+    this.root.render(<MermaidDiagram chart={node.attrs.content} />);
+  }
+
+  update(node: ProseMirrorNode): boolean {
+    // Only accept updates to the same node type
+    if (node.type.name !== 'mermaid') return false;
+
+    // Re-render with new content
+    this.root.render(<MermaidDiagram chart={node.attrs.content} />);
+    return true;
+  }
+
+  destroy(): void {
+    this.root.unmount();
+  }
+
+  // Make node non-editable
+  stopEvent(): boolean {
+    return true;
+  }
+}
+
+/**
+ * Chart NodeView - renders charts from CSV data
+ */
+export class ChartNodeView implements NodeView {
+  dom: HTMLElement;
+  private root: Root;
+  private currentPagePath: string | null;
+  private abortController: AbortController | null = null;
+
+  constructor(node: ProseMirrorNode, _view: EditorView, _getPos: () => number | undefined, currentPagePath: string | null) {
+    this.currentPagePath = currentPagePath;
+    this.dom = document.createElement('div');
+    this.dom.className = 'chart-node-view';
+
+    // Create React root
+    this.root = createRoot(this.dom);
+
+    // Load and render chart
+    this.renderChart(node);
+  }
+
+  private async renderChart(node: ProseMirrorNode): Promise<void> {
+    const { src, chartType } = node.attrs;
+
+    // Cancel any pending request
+    if (this.abortController) {
+      this.abortController.abort();
+    }
+
+    // Create new abort controller for this request
+    this.abortController = new AbortController();
+    const signal = this.abortController.signal;
+
+    // Render loading state
+    this.root.render(
+      <div className="flex items-center justify-center h-64 border rounded-md bg-muted/10">
+        <p className="text-muted-foreground">Loading chart...</p>
+      </div>
+    );
+
+    try {
+      // Fetch CSV data
+      const csvData = await fetchCSVData(src, this.currentPagePath, signal);
+
+      // Check if request was aborted
+      if (signal.aborted) return;
+
+      // Render chart
+      this.root.render(
+        <ChartViewer
+          csvData={csvData}
+          chartType={chartType as ChartType}
+          title={src}
+        />
+      );
+    } catch (error) {
+      // Don't render error if request was aborted
+      if (error instanceof Error && error.name === 'AbortError') {
+        return;
+      }
+
+      // Render error state
+      this.root.render(
+        <div className="border border-destructive rounded-md p-4 my-4 bg-destructive/10">
+          <p className="text-sm text-destructive">
+            <strong>Chart Error:</strong> {error instanceof Error ? error.message : 'Failed to load chart'}
+          </p>
+          <p className="text-xs mt-2 text-muted-foreground">Source: {src}</p>
+        </div>
+      );
+    }
+  }
+
+  update(node: ProseMirrorNode): boolean {
+    // Only accept updates to the same node type
+    if (node.type.name !== 'chart') return false;
+
+    // Re-render with new data
+    this.renderChart(node);
+    return true;
+  }
+
+  destroy(): void {
+    // Cancel any pending request
+    if (this.abortController) {
+      this.abortController.abort();
+    }
+    this.root.unmount();
+  }
+
+  // Make node non-editable
+  stopEvent(): boolean {
+    return true;
+  }
+}
+
+/**
+ * Create nodeViews map for ProseMirror EditorView
+ */
+export function createNodeViews(currentPagePath: string | null) {
+  return {
+    mermaid: (node: ProseMirrorNode) => new MermaidNodeView(node),
+    chart: (node: ProseMirrorNode, view: EditorView, getPos: () => number | undefined) =>
+      new ChartNodeView(node, view, getPos, currentPagePath),
+  };
+}
diff --git a/frontend/src/editor/schema.ts b/frontend/src/editor/schema.ts
index 053948d..1279640 100644
--- a/frontend/src/editor/schema.ts
+++ b/frontend/src/editor/schema.ts
@@ -79,6 +79,55 @@ const imageNodeSpec: NodeSpec = {
   },
 };
 
+// Mermaid diagram node specification
+const mermaidNodeSpec: NodeSpec = {
+  attrs: {
+    content: { default: '' },
+  },
+  group: 'block',
+  parseDOM: [{
+    tag: 'div[data-mermaid]',
+    getAttrs(dom) {
+      const element = dom as HTMLElement;
+      return {
+        content: element.getAttribute('data-mermaid') || '',
+      };
+    },
+  }],
+  toDOM(node) {
+    return ['div', {
+      'data-mermaid': node.attrs.content,
+      class: 'mermaid-block',
+    }, ['pre', node.attrs.content]];
+  },
+};
+
+// Chart reference node specification
+const chartNodeSpec: NodeSpec = {
+  attrs: {
+    src: {},
+    chartType: { default: null },
+  },
+  group: 'block',
+  parseDOM: [{
+    tag: 'div[data-chart]',
+    getAttrs(dom) {
+      const element = dom as HTMLElement;
+      return {
+        src: element.getAttribute('data-chart') || '',
+        chartType: element.getAttribute('data-chart-type'),
+      };
+    },
+  }],
+  toDOM(node) {
+    return ['div', {
+      'data-chart': node.attrs.src,
+      'data-chart-type': node.attrs.chartType,
+      class: 'chart-block',
+    }, `Chart: ${node.attrs.src}`];
+  },
+};
+
 // Get table nodes with alignment support for GFM tables
 // Using inline* for cellContent to allow direct inline content from markdown parser
 const tableNodeSpecs = tableNodes({
@@ -97,11 +146,14 @@ const tableNodeSpecs = tableNodes({
   },
 });
 
-// Combine basic nodes + list nodes + table nodes + image node
+// Combine basic nodes + list nodes + table nodes + image node + mermaid + chart
 const nodesWithLists = addListNodes(basicSchema.spec.nodes, 'paragraph block*', 'block');
 const nodesWithImages = nodesWithLists.addBefore('text', 'image', imageNodeSpec);
+const nodesWithVisualization = nodesWithImages.append(tableNodeSpecs)
+  .addToEnd('mermaid', mermaidNodeSpec)
+  .addToEnd('chart', chartNodeSpec);
 const schemaSpec = {
-  nodes: nodesWithImages.append(tableNodeSpecs),
+  nodes: nodesWithVisualization,
   marks: basicSchema.spec.marks,
 };
 
@@ -125,6 +177,8 @@ export const schema = new Schema(schemaSpec);
  * - table_header: Header cell (th) with optional alignment
  * - table_cell: Regular cell (td) with optional alignment
  * - image: Inline image with src, alt, title attributes
+ * - mermaid: Mermaid diagram block with content attribute
+ * - chart: Chart reference block with src and chartType attributes
  * - text: Inline text node
  *
  * Marks: