feat: final schema pass — sync 9 schema changes from main repo

- Rename nodes.content → nodes.notes across all services, tools, API routes, and UI
- Add dimensions.icon column support (GET/POST routes, types)
- Add nodes.event_date column (create/update flows, types)
- Drop nodes.type and nodes.is_pinned references
- Drop edges.user_feedback references
- Drop chat_memory_state table (replaced with DROP IF EXISTS in migration)
- Update schema guide files (system/schema.md)
- Add runtime migration block in sqlite-client.ts for existing databases
- Fix MCP tool schemas (external API keeps 'content' param, maps to 'notes' internally)
- Update standalone MCP server (nodeService.js, sqlite-client.js, index.js)
- Update HTTP MCP server (server.js, stdio-server.js)
- Update all extraction tools (paper, website, youtube)
- Update all UI components (FocusPanel, ThreePanelLayout, GridView, ListView, FolderViewOverlay)
- TypeScript: 0 errors

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/config/guides/system/schema.md

@@ -14,13 +14,12 @@ immutable: true
 | id | INTEGER | Primary key, auto-increment |
 | title | TEXT | Required |
 | description | TEXT | AI-generated grounding context (~1 sentence) |
-| content | TEXT | User's notes/thoughts (not source content) |
+| notes | TEXT | User's notes/thoughts (not source content) |
 | chunk | TEXT | Full verbatim source content |
 | chunk_status | TEXT | 'pending', 'chunked', 'failed' |
 | link | TEXT | External URL (only for nodes representing external content) |
-| type | TEXT | Nullable (reserved for future use) |
+| event_date | TEXT | When the content happened (ISO date) — distinct from created_at |
 | metadata | TEXT | JSON blob (map_position, transcript_length, etc.) |
-| is_pinned | INTEGER | Legacy — use hub node queries instead |
 | created_at | TEXT | ISO timestamp |
 | updated_at | TEXT | ISO timestamp |
 
@@ -38,29 +37,40 @@ immutable: true
 ### dimensions
 | Column | Type | Notes |
 |--------|------|-------|
-| id | INTEGER | Primary key |
-| name | TEXT | Unique, case-insensitive |
+| name | TEXT | Primary key |
 | description | TEXT | Purpose description |
-| is_locked | INTEGER | 1 = priority dimension (auto-assigns to new nodes) |
+| icon | TEXT | Emoji or icon identifier for UI display |
+| is_priority | INTEGER | 1 = priority dimension (auto-assigns to new nodes) |
+| updated_at | TEXT | ISO timestamp |
 
 ### node_dimensions (junction)
 | Column | Type |
 |--------|------|
 | node_id | INTEGER FK → nodes.id |
-| dimension_id | INTEGER FK → dimensions.id |
+| dimension | TEXT (dimension name) |
 
 ### chunks (for semantic search)
 | Column | Type | Notes |
 |--------|------|-------|
 | id | INTEGER | Primary key |
 | node_id | INTEGER | FK → nodes.id |
-| chunk_index | INTEGER | Position in sequence |
+| chunk_idx | INTEGER | Position in sequence |
 | text | TEXT | Chunk content |
-| embedding | BLOB | Vector (via sqlite-vec) |
+| created_at | TEXT | ISO timestamp |
+| embedding_type | TEXT | Embedding model used |
+| metadata | TEXT | JSON blob |
+
+### voice_usage (daily tracking)
+| Column | Type | Notes |
+|--------|------|-------|
+| id | INTEGER | Primary key |
+| date | TEXT | ISO date (UNIQUE) |
+| minutes_used | REAL | Minutes consumed |
+| updated_at | TEXT | ISO timestamp |
 
 ### FTS Tables
 - `chunks_fts` — full-text search on chunk text
-- `nodes_fts` — full-text search on node title + content
+- `nodes_fts` — full-text search on node title + notes
 
 ## Common Query Patterns
 
@@ -76,8 +86,7 @@ GROUP BY n.id ORDER BY edge_count DESC LIMIT 5
 ```sql
 SELECT n.* FROM nodes n
 JOIN node_dimensions nd ON n.id = nd.node_id
-JOIN dimensions d ON nd.dimension_id = d.id
-WHERE d.name = ?
+WHERE nd.dimension = ?
 ```
 
 **Edges for a node (both directions):**
@@ -89,4 +98,14 @@ JOIN nodes n2 ON e.to_node_id = n2.id
 WHERE e.from_node_id = ? OR e.to_node_id = ?
 ```
 
-**Use sqliteQuery for any read operation not covered by structured tools.**
+**Search source content (chunks):**
+```sql
+SELECT c.id, c.node_id, c.chunk_idx, c.text, n.title
+FROM chunks c
+JOIN nodes n ON c.node_id = n.id
+WHERE c.text LIKE '%search term%' COLLATE NOCASE
+ORDER BY c.chunk_idx ASC
+LIMIT 10
+```
+
+**Use `rah_search_content` to search chunks by keyword, or `rah_sqlite_query` for any read operation not covered by structured tools.**