fix: address code review findings

- Fix accent color CSS variable: write to --or-accent-override
- Fix actionDelete double-fire: toolbar button first, key fallback
- Fix localStorage collision: use chrome.storage.local for sidebar
- Fix updateSettings preserving keyboard selection state
- Add document.body guard for count badge creation

content/content.js

@@ -62,7 +62,7 @@
 
     // Accent color
     if (settings.accentColor) {
-      document.documentElement.style.setProperty('--or-accent', settings.accentColor);
+      document.documentElement.style.setProperty('--or-accent-override', settings.accentColor);
     }
 
     console.log('[Outlook Relook] Settings applied to DOM');