feat: Rebrand frontend from Patherly to ResolutionFlow

- Add brand assets (favicon, icons, logos) to public/icons and src/assets/brand
- Update index.html with new favicon, title, meta, Google Fonts (Plus Jakarta Sans, Inter, Outfit)
- Add brand colors, font families, and gradient utilities to Tailwind config
- Replace CSS variables with purple-tinted theme for both light and dark modes
- Create reusable BrandLogo and BrandWordmark components
- Update AppLayout header with logo and wordmark
- Update LoginPage and RegisterPage with branded logo, wordmark, and gradient buttons
- Replace all remaining "Patherly" references in SettingsPage

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

frontend/src/pages/SettingsPage.tsx

@@ -25,7 +25,7 @@ export function SettingsPage() {
         <div className="rounded-lg border border-border bg-card p-6 shadow-sm">
           <h2 className="text-lg font-semibold text-card-foreground">Appearance</h2>
           <p className="mt-1 text-sm text-muted-foreground">
-            Customize how Patherly looks on your device
+            Customize how ResolutionFlow looks on your device
           </p>
 
           <div className="mt-4">
@@ -79,10 +79,10 @@ export function SettingsPage() {
         <div className="rounded-lg border border-border bg-card p-6 shadow-sm">
           <h2 className="text-lg font-semibold text-card-foreground">About</h2>
           <p className="mt-1 text-sm text-muted-foreground">
-            Patherly - Troubleshooting Decision Trees
+            ResolutionFlow - Decision Tree Platform
           </p>
           <p className="mt-2 text-sm text-muted-foreground">
-            "Take the path MOST traveled."
+            Transform troubleshooting into guided workflows
           </p>
         </div>
       </div>