design: improve UI consistency and footer layout

- Update text sizing to text-base throughout for consistency
- Improve arrow icon visibility (gray-400 → gray-200 on hover)
- Reorganize tool badges: Open Source first, specialty second, Free third
- Update badge labels: Vert (Converter), Stirling (PDF), Units/Figlet (Open Source)
- Redesign footer: single-row layout with brand pill, centered copyright, GitHub link
- Update footer border: lighter gray-600, constrained to content width

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

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

components/ToolsGrid.tsx

@@ -10,7 +10,7 @@ const tools = [
     url: 'https://vert.kit.pivoine.art',
     gradient: 'gradient-green-teal',
     accentColor: '#10b981',
-    badges: ['Privacy', 'Open Source', 'Free'],
+    badges: ['Open Source', 'Converter', 'Free'],
     icon: (
       <svg className="w-12 h-12 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
         <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 16l4.586-4.586a2 2 0 012.828 0L16 16m-2-2l1.586-1.586a2 2 0 012.828 0L20 14m-6-6h.01M6 20h12a2 2 0 002-2V6a2 2 0 00-2-2H6a2 2 0 00-2 2v12a2 2 0 002 2z" />
@@ -40,7 +40,7 @@ const tools = [
     url: 'https://stirling.kit.pivoine.art',
     gradient: 'gradient-purple-blue',
     accentColor: '#667eea',
-    badges: ['Privacy', 'Open Source', 'Free'],
+    badges: ['Open Source', 'PDF', 'Free'],
     icon: (
       <svg className="w-12 h-12 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
         <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M7 21h10a2 2 0 002-2V9.414a1 1 0 00-.293-.707l-5.414-5.414A1 1 0 0012.586 3H7a2 2 0 00-2 2v14a2 2 0 002 2z" />
@@ -54,7 +54,7 @@ const tools = [
     url: 'https://units.kit.pivoine.art',
     gradient: 'gradient-cyan-purple',
     accentColor: '#2dd4bf',
-    badges: ['Real-time', 'Free'],
+    badges: ['Open Source', 'Real-time', 'Free'],
     icon: (
       <svg className="w-12 h-12 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
         <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M7 16V4m0 0L3 8m4-4l4 4m6 0v12m0 0l4-4m-4 4l-4-4" />
@@ -67,7 +67,7 @@ const tools = [
     url: 'https://draw.kit.pivoine.art',
     gradient: 'gradient-pink-rose',
     accentColor: '#ec4899',
-    badges: ['Collaborative', 'Open Source', 'Free'],
+    badges: ['Open Source', 'Collaborative', 'Free'],
     icon: (
       <svg className="w-12 h-12 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
         <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15.232 5.232l3.536 3.536m-2.036-5.036a2.5 2.5 0 113.536 3.536L6.5 21.036H3v-3.572L16.732 3.732z" />
@@ -80,7 +80,7 @@ const tools = [
     url: 'https://figlet.kit.pivoine.art',
     gradient: 'gradient-yellow-amber',
     accentColor: '#eab308',
-    badges: ['373 Fonts', 'ASCII Art', 'Free'],
+    badges: ['Open Source', 'ASCII Art', 'Free'],
     icon: (
       <svg className="w-12 h-12 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
         <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M3.5 13h6" />