Team# 08: DayOneCrew: Added AI Agentic Search with Vector Recommendations using Valkey

[himanshug3385]

Summary
Fix agent search relevance: Topic-aware NLU so queries like “cheaper vegetables” are not treated as price refinements of a prior science-gift search. New product domains (groceries vs science), topic-shift detection, and relevance filtering return only matching products—or a clear message when the category is not sold on the site.
Improve floating assistant UX: Agent FAB stays fixed, scroll-aware, and clickable (including when the chat panel is open).
Add light/dark theme (default dark): App-wide theme via ThemeProvider, with toggles in the AI assistant header and on the Valkey dashboard (/valkey-dashboard).
What changed
Backend (backend/services/agent.js)
Product domain detection (groceries, science/STEM).
isTopicShift() / updated isRefinementQuery() so “cheaper” only refines the same topic (e.g. “Show me cheaper options” after a science search still works).
filterRelevantProducts() drops irrelevant catalog matches.
Polite unavailable copy when users ask for groceries/vegetables (not in the mock catalog).
Removed hardcoded “science gift search” wording from refinement responses.
Frontend
ThemeContext, ThemeToggle, theme.scss — default dark, persisted in localStorage.
AgentAssistant — fixed layer, scroll-adjusted FAB position, visible close control when panel is open.
AgentSearchChat — theme toggle in header.
ValkeyDashboardPage + valkey-dashboard.scss — theme toggle and dark/light styling.
agent-assistant.scss — theme variables and layout fixes.
Test plan

Start backend + Valkey; open the AI assistant on any page.

Search: “birthday gift for 10-year-old nephew who likes science” → science/STEM products.

Follow up: “Show me cheaper options” → cheaper items from the same science context (not unrelated products).

New topic: “show me some cheaper vegetables” → no science kits; polite message that groceries are not available on this site.

Scroll a long page (e.g. home/shop) → orange FAB remains visible and clickable near the bottom.

Open assistant panel → FAB still works as close/minimize control.

Toggle dark/light in assistant header → UI updates; refresh → preference persists.

Open /valkey-dashboard → theme toggle works; panels/stats readable in both modes.

Run node backend/test-acceptance.js → all acceptance checks pass.
Notes
The mock catalog is science/STEM only; grocery queries intentionally return zero results with a helpful message instead of irrelevant kits.
Theme applies to the agent UI and Valkey dashboard; the main store pages keep their existing styling unless extended later.

[rlunar]

Remove node_modules folder, check .gitignore from frontend directory.