feat(ui): project details panel + compact/responsive cards; rename Sentinel→Yerin (red); migrate research_notes

- Project card expands to show description + status + dates (was only the research stub)
- Cards compacted + responsive (actions wrap on narrow)
- Sentinel renamed Yerin everywhere (#/yerin, red 'Sage of the Endless Sword' theme + red sidebar dot)
- void1 importer now carries research_notes/last_researched_at (was dropped)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

public/router.js

@@ -21,7 +21,7 @@ const ROUTES = [
   { name: 'search',   re: /^\/search$/,            keys: [] },
   { name: 'inbox',    re: /^\/inbox$/,             keys: [] },
   { name: 'sacred-valley', re: /^\/sacred-valley$/, keys: [] },
-  { name: 'sentinel', re: /^\/sentinel$/, keys: [] },
+  { name: 'yerin', re: /^\/(yerin|sentinel)$/, keys: [] },
   { name: 'little-blue', re: /^\/little-blue$/, keys: [] },
   { name: 'terminal', re: /^\/terminal$/, keys: [] },
   { name: 'settings', re: /^\/settings$/, keys: [] },