feat: improve related notes algorithm and add seed data

- Add multilingual stop words (English + Spanish) for better matching
- Add technical keywords set for relevance scoring
- Improve scoring weights: tags +3, title matches +3
- Fix false positives between unrelated notes
- Add README with usage instructions
- Add 47 seed examples for testing
- Update quick add shortcut behavior
- Add project summary

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

src/components/quick-add.tsx

@@ -62,11 +62,18 @@ export function QuickAdd() {
   // Focus on keyboard shortcut
   useEffect(() => {
     const handleGlobalKeyDown = (e: KeyboardEvent) => {
-      if (e.key === 'n' && (e.metaKey || e.ctrlKey)) {
+      // Ctrl+N or Cmd+N to focus quick add
+      if ((e.key === 'n' && (e.metaKey || e.ctrlKey)) || (e.key === 'n' && e.altKey)) {
         e.preventDefault()
         inputRef.current?.focus()
+        inputRef.current?.select()
         setIsExpanded(true)
       }
+      // Escape to blur
+      if (e.key === 'Escape' && document.activeElement === inputRef.current) {
+        inputRef.current?.blur()
+        setIsExpanded(false)
+      }
     }
     window.addEventListener('keydown', handleGlobalKeyDown)
     return () => window.removeEventListener('keydown', handleGlobalKeyDown)