Open Mermaid sources from GitHub

[LJAYi]

Summary

• add an Open from GitHub entry to the static web app
• complete PKCE authorization without exposing GitHub credentials to browser storage
• browse installations, repositories, folders, Mermaid files, and Mermaid blocks in Markdown
• load the selected source into the existing local preview/export pipeline with provenance and unsaved-change protection
• configure the production broker origin, tighten CSP, and update privacy/deployment documentation

Privacy

The broker retrieves only the selected source and does not retain it. Rendering and PPTX/SVG/draw.io/JSON Canvas generation remain in the browser.

Validation

• full workspace type check
• full workspace tests (202 tests)
• full workspace build
• Playwright E2E (25 tests)

Stacked on #17 and should be retargeted to main after #17 merges.

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Review details

⚙️ Run configuration

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Run ID: 33f1637b-dd7a-41af-b9a3-3d2402391f15

📥 Commits

Reviewing files that changed from the base of the PR and between 6d4cae4 and a16aa6d.

📒 Files selected for processing (11)

• .github/workflows/pages.yml
• README.md
• apps/web/.env.example
• apps/web/index.html
• apps/web/package.json
• apps/web/src/github-source.ts
• apps/web/src/main.ts
• apps/web/src/styles.css
• apps/web/tests/e2e/workbench.spec.ts
• apps/web/tests/github-source.test.ts
• docs/github-app-mvp.md

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