feat(floating-ai): step 8 — page interactions (all variants)

Register AI sections across all content pages with dual-anchor scroll
tracking, cross-page navigation via [SECTION:xxx] tags, and right-margin
positioning for the notes editor.

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

docs/floating-ai-integration-guide.md

@@ -959,7 +959,7 @@ const { state: floatingState } = useFloatingChat();
 
 ## Step 8a: Page Interactions — Project Detail
 
-**Status**: [ ]
+**Status**: [x] (2026-02-28)
 **Prerequisites**: Steps 1-4 completed
 **Modifies**: `src/renderer/components/projects/ProjectDetail.tsx`
 
@@ -1022,7 +1022,7 @@ Repeat for all 4 sections.
 
 ## Step 8b: Page Interactions — Tasks Page
 
-**Status**: [ ]
+**Status**: [x] (2026-02-28)
 **Prerequisites**: Steps 1-4 completed
 **Modifies**: `src/renderer/routes/tasks.tsx`
 
@@ -1055,7 +1055,7 @@ Same pattern as 8a — create refs, add `data-ai-section` attributes, register i
 
 ## Step 8c: Page Interactions — Timeline Page
 
-**Status**: [ ]
+**Status**: [x] (2026-02-28)
 **Prerequisites**: Steps 1-4 completed
 **Modifies**: `src/renderer/routes/timeline.tsx`
 
@@ -1082,7 +1082,7 @@ Register 1 section:
 
 ## Step 8d: Page Interactions — Notes Page (Milkdown)
 
-**Status**: [ ]
+**Status**: [x] (2026-02-28)
 **Prerequisites**: Steps 1-4 completed
 **Modifies**: `src/renderer/routes/notes.$noteId.tsx`