docs: create sprint-002 specification and mark all tasks as completed

docs/specs/active.md

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-sprint-001-sync-reliability.md
+sprint-002-ux-search-metadata.md

docs/specs/sprint-002-ux-search-metadata.md

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+# Sprint 002 — UX Overhaul, Full-Text Search & Metadata Enrichment
+
+**Goal:** Overhaul the t-youtube reading experience by completing the search workflow, adding transcript visibility, fetching duration/views metadata, and implementing cursor-based/offset pagination (infinite scroll).
+
+---
+
+## [x] T2.1 — Full-Text Search Frontend Integration
+- **Files:** `frontend/src/routes/YoutubeDashboard.svelte`
+- **Done means:** Search queries directly populate the main video list in the sidebar (rather than a temporary dropdown), and clearing the search resets the view.
+- **Verify by:** 
+  1. Type search query -> video list dynamically updates with FTS results from backend.
+  2. Click a search result -> detail view loads it.
+  3. Clear query/blur search -> list reverts to standard tab view.
+
+## [x] T2.2 — Transcript Accordion in Details View
+- **Files:** `frontend/src/routes/YoutubeDashboard.svelte`
+- **Done means:** Add an expandable accordion below the "AI Digest" section to view the raw video transcript. If transcript is long, render in scrollable container.
+- **Verify by:**
+  1. Click video with transcript -> "Show Full Transcript" accordion appears.
+  2. Click to expand -> raw transcript displays correctly.
+
+## [x] T2.3 — Ingest Duration and View Count Metadata
+- **Files:** `backend/fetcher.py`, `backend/tests/test_fetcher.py`
+- **Done means:** Update `fetcher.py` videos.list API call to request `part="snippet,contentDetails,statistics"`. Parse ISO 8601 duration into integer seconds, and store duration + view count in SQLite db. Update unit tests to include mock response fields.
+- **Verify by:**
+  1. Run `./run_tests.sh` to ensure fetcher tests pass.
+  2. Sync subscriptions -> inspect database to confirm `duration` and `view_count` are populated for new videos.
+
+## [x] T2.4 — Cursor/Offset Pagination (Infinite Scroll)
+- **Files:** `backend/main.py`, `frontend/src/routes/YoutubeDashboard.svelte`
+- **Done means:** Add pagination queries to `/api/videos` backend endpoint (e.g. `offset` and `limit`). In Svelte frontend, implement scroll listener on the sidebar video list to trigger next page load when reaching bottom.
+- **Verify by:**
+  1. Load pending tab -> initially loads 50 videos.
+  2. Scroll to bottom of sidebar -> next 50 videos append automatically.