Add user authentication with login/register

- Add users and sessions tables to database schema
- Add bcryptjs for password hashing
- Create auth API routes (login, register, logout, me)
- Add AuthProvider context for client-side auth state
- Update all API routes to require authentication and filter by userId
- Create login and register pages
- Add AppShell component for authenticated layout
- Update all pages to use AppShell and show user info
- Each user now has their own private entries and tags

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

package-lock.json

@@ -8,6 +8,7 @@
       "name": "quietthanks",
       "version": "0.1.0",
       "dependencies": {
+        "bcryptjs": "^3.0.3",
         "better-sqlite3": "^12.6.2",
         "drizzle-orm": "^0.45.1",
         "lucide-react": "^0.562.0",
@@ -18,6 +19,7 @@
       },
       "devDependencies": {
         "@tailwindcss/postcss": "^4",
+        "@types/bcryptjs": "^2.4.6",
         "@types/better-sqlite3": "^7.6.13",
         "@types/node": "^20",
         "@types/react": "^19",
@@ -2417,6 +2419,13 @@
         "tslib": "^2.4.0"
       }
     },
+    "node_modules/@types/bcryptjs": {
+      "version": "2.4.6",
+      "resolved": "https://registry.npmjs.org/@types/bcryptjs/-/bcryptjs-2.4.6.tgz",
+      "integrity": "sha512-9xlo6R2qDs5uixm0bcIqCeMCE6HiQsIyel9KQySStiyqNl2tnj2mP3DX1Nf56MD6KMenNNlBBsy3LJ7gUEQPXQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/better-sqlite3": {
       "version": "7.6.13",
       "resolved": "https://registry.npmjs.org/@types/better-sqlite3/-/better-sqlite3-7.6.13.tgz",
@@ -3345,6 +3354,15 @@
         "baseline-browser-mapping": "dist/cli.js"
       }
     },
+    "node_modules/bcryptjs": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/bcryptjs/-/bcryptjs-3.0.3.tgz",
+      "integrity": "sha512-GlF5wPWnSa/X5LKM1o0wz0suXIINz1iHRLvTS+sLyi7XPbe5ycmYI3DlZqVGZZtDgl4DmasFg7gOB3JYbphV5g==",
+      "license": "BSD-3-Clause",
+      "bin": {
+        "bcrypt": "bin/bcrypt"
+      }
+    },
     "node_modules/better-sqlite3": {
       "version": "12.6.2",
       "resolved": "https://registry.npmjs.org/better-sqlite3/-/better-sqlite3-12.6.2.tgz",