refactor: adopt shared Input/Textarea components (#101)

* refactor: adopt shared Input/Textarea components across 15 files

Replace 42 raw <input>/<textarea> elements with <Input>/<Textarea>
from components/ui/. Consistent focus states, error handling, and
styling across all form fields.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* refactor: replace hardcoded rgba/hex colors with Tailwind tokens

- rgba(255,255,255,0.xx) → bg-white/[0.xx], border-white/[0.xx]
- rgba(6,182,212,0.3) → border-primary/30 (focus states)
- #0a0a0a → bg-background
- Inline style hex colors → var(--color-primary), var(--color-brand-gradient-to)
- 28 files updated, zero hardcoded rgba() patterns remaining

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: add PageMeta to 16 pages for SEO and proper browser tab titles

Public pages (Login, Register, Forgot/Reset Password, Verify Email,
Survey Thank You) get descriptions for SEO. Authenticated pages
(Dashboard, Flow Library, My Flows, Session History, AI Assistant,
Account Settings, Step Library, My Shares, Feedback, Guides) get
proper tab titles.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: add page transitions and staggered list animations

- ViewTransitionOutlet: wraps Outlet with fade-in-up animation keyed
  to route path. Sidebar/topbar stay still, only content area animates.
- StaggerList: reusable component that cascades children with
  incremental delay (50ms default). Pure CSS via @utility stagger-item.
- Applied stagger to TreeGridView, MyTreesPage cards, SessionHistoryPage.
- New stagger-fade-in keyframe in @theme block.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: ViewTransitionOutlet needs h-full for React Flow canvas

The wrapper div broke the height chain needed by TreeEditorPage's
h-full layout, causing React Flow canvas to collapse to zero height.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: main-content flex layout for tree editor + scrollable pages

Main content area is now flex-col so the ViewTransitionOutlet wrapper
gets an explicit computed height via flex-1 min-h-0. This makes h-full
resolve correctly in the tree editor (React Flow canvas) while still
allowing overflow-y-auto scrolling for normal pages.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: resolve ESLint errors in Button and Skeleton components

- Button: suppress react-refresh/only-export-components for buttonVariants re-export
- Skeleton: replace empty interface with type alias, replace Math.random() with static widths array

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: add PageMeta, animation classes, and layout fixes to remaining pages

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -42,6 +42,11 @@
 
 When adding new pages/components: use "ResolutionFlow" branding, ice-cyan gradient accent theme, `.glass-card` / `.glass-card-static` containers, `text-foreground`/`text-muted-foreground` hierarchy. Primary actions use `bg-gradient-brand`. Pages render inside the app shell (CSS Grid: topbar + sidebar + main). Use "Flows" not "Trees" in all user-facing text; use "Projects" not "Procedures" for procedural flows. Reference [UI-DESIGN-SYSTEM.md](UI-DESIGN-SYSTEM.md) for layout patterns, navigation, and component specs.
 
+## Implementation Principles
+
+- Prefer correct architecture over minimal diff
+- If two approaches exist, implement the one that scales, not the one that's faster to write
+- Flag any "simpler approach" tradeoffs for product owner review before proceeding
 ---
 
 ## Current State