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/lib/utils/date.ts

@@ -0,0 +1,69 @@
+/**
+ * Date formatting utilities for recent notes display
+ */
+
+/**
+ * Format a date as relative time in English (e.g., "2 hours ago", "yesterday")
+ */
+export function formatRelativeTime(date: Date | string): string {
+  const now = new Date()
+  const then = new Date(date)
+  const seconds = Math.floor((now.getTime() - then.getTime()) / 1000)
+
+  if (seconds < 60) return 'just now'
+
+  const minutes = Math.floor(seconds / 60)
+  if (minutes < 60) {
+    return `${minutes} minute${minutes > 1 ? 's' : ''} ago`
+  }
+
+  const hours = Math.floor(minutes / 60)
+  if (hours < 24) {
+    return `${hours} hour${hours > 1 ? 's' : ''} ago`
+  }
+
+  const days = Math.floor(hours / 24)
+  if (days < 7) {
+    return `${days} day${days > 1 ? 's' : ''} ago`
+  }
+
+  // For dates older than 7 days, show absolute date
+  return then.toLocaleDateString('en-US', {
+    month: 'short',
+    day: 'numeric',
+    year: then.getFullYear() !== now.getFullYear() ? 'numeric' : undefined
+  })
+}
+
+/**
+ * Format a date as relative time in French (e.g., "il y a 2 heures", "hier")
+ */
+export function formatRelativeTimeFR(date: Date | string): string {
+  const now = new Date()
+  const then = new Date(date)
+  const seconds = Math.floor((now.getTime() - then.getTime()) / 1000)
+
+  if (seconds < 60) return "à l'instant"
+
+  const minutes = Math.floor(seconds / 60)
+  if (minutes < 60) {
+    return `il y a ${minutes} minute${minutes > 1 ? 's' : ''}`
+  }
+
+  const hours = Math.floor(minutes / 60)
+  if (hours < 24) {
+    return `il y a ${hours} heure${hours > 1 ? 's' : ''}`
+  }
+
+  const days = Math.floor(hours / 24)
+  if (days < 7) {
+    return `il y a ${days} jour${days > 1 ? 's' : ''}`
+  }
+
+  // For dates older than 7 days, show absolute date
+  return then.toLocaleDateString('fr-FR', {
+    day: 'numeric',
+    month: 'short',
+    year: then.getFullYear() !== now.getFullYear() ? 'numeric' : undefined
+  })
+}