Add daisyui integration, remove Header and page components, and update layout structure

bun.lock

@@ -25,6 +25,7 @@
         "@sveltejs/kit": "^2.31.1",
         "@sveltejs/vite-plugin-svelte": "^6.1.2",
         "@tailwindcss/vite": "^4.1.12",
+        "daisyui": "^5.3.8",
         "svelte": "^5.38.1",
         "svelte-check": "^4.3.1",
         "tailwindcss": "^4.1.12",
@@ -49,6 +50,7 @@
       "version": "1.0.0",
       "dependencies": {
         "@convex-dev/better-auth": "^0.9.6",
+        "better-auth": "catalog:",
         "convex": "catalog:",
       },
       "devDependencies": {
@@ -323,6 +325,8 @@
 
     "cookie": ["cookie@0.6.0", "", {}, "sha512-U71cyTamuh1CRNCfpGY6to28lxvNwPG4Guz/EVjgf3Jmzv0vlDp1atT9eS5dDjMYHucpHbWns6Lwf3BKz6svdw=="],
 
+    "daisyui": ["daisyui@5.3.8", "", {}, "sha512-ihDXb07IzM/2ugkwBWdy2LFCaepdn1oGsKIsR3gNG/VuTAmS60+HUG9rskjR5BzyJOVVUDDpWoiX3PBDIT3DYQ=="],
+
     "debug": ["debug@4.4.3", "", { "dependencies": { "ms": "^2.1.3" } }, "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA=="],
 
     "deepmerge": ["deepmerge@4.3.1", "", {}, "sha512-3sUqbMEc77XqpdNO7FRyRog+eW3ph+GYCbj+rK+uYyRMuwsVy0rMiVtPn+QJlKFvWP/1PYpapqYn0Me2knFn+A=="],