fix(landing): design audit fixes — hamburger menu, dead links, branding, spacing (#117)

* fix(landing): design audit fixes — hamburger menu, dead links, branding, spacing

- Add mobile hamburger menu with animated open/close and click-outside dismiss
- Create Privacy and Terms pages (footer links were dead # anchors)
- Change "Decision Tree Platform" to "AI-Powered Troubleshooting for MSPs" on login, register, and HTML title
- Fix register page icon color (was red/coral via CSS invert, now uses BrandLogo directly)
- Replace "0 Ticket Notes Written by Hand" stat with "100% Auto-Generated Documentation"
- Increase nav link touch targets to 44px minimum
- Fix heading hierarchy: section titles are now <h2>, standardize H3 to 1.25rem
- Tighten section spacing (6rem → 4rem padding, remove extra 5rem spacer)
- Add color-scheme: dark to HTML element
- Replace all transition: all with specific properties (10 occurrences)
- Fix loading ellipsis (... → …)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix(mobile): responsive modals + landing preview overflow

- PrepareSessionModal: bottom-sheet on mobile, centered on desktop
- IntakeFormModal: bottom-sheet on mobile, responsive padding
- ShareTreeModal: bottom-sheet on mobile, full-width on small screens
- Landing preview: hide URL bar and window controls on mobile (<900px)
  to prevent 189px horizontal overflow

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix(mobile): collapse search bar to icon on mobile

On mobile (<640px), the full search bar with placeholder text and ⌘K
badge was taking too much space in the topbar. Now shows just a
magnifying glass icon that opens the same command palette on tap.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: chihlasm <michael@resolutionflow.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/router.tsx

@@ -18,6 +18,8 @@ const PublicTemplatesPage = lazy(() => import('@/pages/PublicTemplatesPage'))
 const SharedSessionPage = lazy(() => import('@/pages/SharedSessionPage'))
 const SurveyPage = lazy(() => import('@/pages/SurveyPage'))
 const SurveyThankYouPage = lazy(() => import('@/pages/SurveyThankYouPage'))
+const PrivacyPage = lazy(() => import('@/pages/PrivacyPage'))
+const TermsPage = lazy(() => import('@/pages/TermsPage'))
 
 // Standalone auth pages
 const VerifyEmailPage = lazy(() => import('@/pages/VerifyEmailPage'))
@@ -100,6 +102,16 @@ export const router = sentryCreateBrowserRouter([
     element: page(PublicTemplatesPage),
     errorElement: <RouteError />,
   },
+  {
+    path: '/privacy',
+    element: page(PrivacyPage),
+    errorElement: <RouteError />,
+  },
+  {
+    path: '/terms',
+    element: page(TermsPage),
+    errorElement: <RouteError />,
+  },
   {
     path: '/login',
     element: <LoginPage />,