docs: correct claims contradicted by the source, extend QA checklist

DOCUMENTATION.md said recent files were in-memory only and lost on vault
close, while the code persists them under waypointData.recentFiles; the
WaypointData/RecentFilesSettings/WaypointSettings snippets were also missing
real fields. Fix those, describe the new behaviour (single-writer saves,
settings-driven period detection, O(1) basename lookups, folder-aware rename
remapping, unified openPeriodNote, typechecked build), and trim Known
Limitations to the two still true (full-DOM redraw, CDN icon dependency).

QA.md: restate the 'No icon' case and add coverage for week-number
middle-click and for moving a folder that contains bookmarked files.

QA.md

@@ -40,7 +40,7 @@
 - [ ] Type "arrow" → should find all arrow icons
 - [ ] Type a tag keyword like "fitness" → should find `activity`, `dumbbell`, etc.
 - [ ] Clear search (empty input) → shows first 80 icons
-- [ ] Click "No icon" link → clears the icon
+- [ ] Set an icon on a bookmark, reopen the picker, click "No icon" → the previously-set icon is cleared
 - [ ] Click an icon → preview updates, grid highlights selection
 - [ ] Click Save → icon applied, click Cancel → no change
 - [ ] Test with **network offline** → falls back to FALLBACK_ICONS list
@@ -56,12 +56,14 @@
 - [ ] Hover preview (page preview popup) still works on file bookmarks
 - [ ] Right-click context menu on a file bookmark still shows native Obsidian file-menu items
 - [ ] Bookmarks persist across vault reload
+- [ ] Move a folder containing bookmarked files to a new location → those bookmarks survive and still open the moved files
 
 ## Calendar (Regression)
 
 - [ ] Calendar renders with correct month grid
 - [ ] Click on a day → opens/creates daily note
 - [ ] Click on week number → opens/creates weekly note
+- [ ] Middle-click on a week number → opens/creates the weekly note in a new tab, with no console error
 - [ ] Click Q/M/Y breadcrumb → opens respective period note
 - [ ] ◀/▶ navigation shifts month
 - [ ] "Today" button returns to current month