Redesign dashboard UI with mobile responsive layout

- Add Geist font family and refined OKLCH color palette
- Redesign all dashboard components with polished styling
- Implement URL-synced tabs for performance table (domain, country, source, ad-unit, key-value)
- Add mobile hamburger menu using shadcn Sheet component
- Make sidebar responsive (hidden on mobile, visible on lg+)
- Add custom shadow utilities and improved visual hierarchy
- Add sparklines with gradients to metric cards
- Redesign peak traffic chart as heatmap grid
- Add icons and hover states to frequent filters

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

bun.lock

@@ -24,7 +24,7 @@
       },
       "devDependencies": {
         "@internationalized/date": "^3.10.1",
-        "@lucide/svelte": "^0.562.0",
+        "@lucide/svelte": "^0.561.0",
         "@macalinao/tsconfig": "catalog:",
         "@sveltejs/adapter-static": "^3.0.8",
         "@sveltejs/kit": "^2.21.1",
@@ -142,7 +142,7 @@
 
     "@jridgewell/trace-mapping": ["@jridgewell/trace-mapping@0.3.31", "", { "dependencies": { "@jridgewell/resolve-uri": "^3.1.0", "@jridgewell/sourcemap-codec": "^1.4.14" } }, "sha512-zzNR+SdQSDJzc8joaeP8QQoCQr8NuYx2dIIytl1QeBEZHJ9uW6hebsrYgbz8hJwUQao3TWCMtmfV8Nu1twOLAw=="],
 
-    "@lucide/svelte": ["@lucide/svelte@0.562.0", "", { "peerDependencies": { "svelte": "^5" } }, "sha512-wDMULwtTFN2Sc/TFBm6gfuVCNb4Y5P9LDrwxNnUbV52+IEU7NXZmvxwXoz+vrrpad6Xupq+Hw5eUlqIHEGhouw=="],
+    "@lucide/svelte": ["@lucide/svelte@0.561.0", "", { "peerDependencies": { "svelte": "^5" } }, "sha512-vofKV2UFVrKE6I4ewKJ3dfCXSV6iP6nWVmiM83MLjsU91EeJcEg7LoWUABLp/aOTxj1HQNbJD1f3g3L0JQgH9A=="],
 
     "@macalinao/biome-config": ["@macalinao/biome-config@0.1.7", "", { "peerDependencies": { "@biomejs/biome": "^2.3.10" } }, "sha512-JijaB/REJr6D3fGV36d1XGsf2WFofgnMS1WbOYcNJCQpic2XmFALV7GNL28z7rDCN3/DeSovPuW/1yImce7kPA=="],