feat: rename keep-notes to memento-note, migrate to PostgreSQL, fix MCP bugs

- Rename directory keep-notes -> memento-note with all code references
- Prisma: SQLite -> PostgreSQL (both app and MCP server schemas)
- Sync MCP schema with main app (add missing fields, relations, indexes)
- Delete 17 SQLite migrations (clean slate for PostgreSQL)
- Remove SQLite dependencies (@libsql/client, better-sqlite3, etc.)
- Fix MCP server: hardcoded Windows DB paths -> DATABASE_URL env var
- Fix MCP server: .dockerignore excluded index-sse.js (SSE mode broken)
- MCP Dockerfile: node:20 -> node:22
- Docker Compose: add postgres service, remove SQLite volume
- Generate favicon.ico, icon-192.png, icon-512.png, apple-icon.png
- Update layout.tsx icons and manifest.json for PNG icons
- Update all .env files for PostgreSQL
- Rewrite README.md with updated sections
- Remove mcp-server/node_modules and prisma/client-generated from git tracking

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

memento-note/hooks/use-resize-observer.ts

@@ -0,0 +1,33 @@
+'use client';
+
+import { useEffect, useRef } from 'react';
+
+export function useResizeObserver(callback: (entry: ResizeObserverEntry) => void) {
+  const ref = useRef<HTMLElement>(null);
+  const frameId = useRef<number>(0);
+
+  useEffect(() => {
+    const element = ref.current;
+    if (!element) return;
+
+    const observer = new ResizeObserver((entries) => {
+      // Cancel previous frame to avoid stacking updates
+      if (frameId.current) cancelAnimationFrame(frameId.current);
+      
+      frameId.current = requestAnimationFrame(() => {
+        for (const entry of entries) {
+          callback(entry);
+        }
+      });
+    });
+
+    observer.observe(element);
+
+    return () => {
+      observer.disconnect();
+      if (frameId.current) cancelAnimationFrame(frameId.current);
+    };
+  }, [callback]);
+
+  return ref;
+}