feat(KB-048): add collapsible list sections to dashboard

- Add section expansion state management with localStorage persistence
- Update section headers with chevron toggle controls
- Implement conditional task row rendering based on section state
- Add Expand All / Collapse All toolbar controls
- Add CSS styles for chevron rotation animation and section headers
- Add comprehensive tests for collapsible section behavior

.changeset/simplify-github-import-modal.md

@@ -0,0 +1,12 @@
+---
+"@dustinbyrne/kb": patch
+---
+
+Simplify GitHub import modal by removing manual owner/repo input fields
+
+The GitHub import modal now relies solely on git remote detection:
+- Single remote: automatically selected and displayed as read-only text
+- Multiple remotes: clean dropdown for selection
+- No remotes: helpful message with instructions to add a remote
+
+This reduces UI clutter and prevents confusion between manual entry and remote selection.