refactor(frontend): inline styles to Tailwind, CSS layer fix, theme switch bug

[radicalkjax]

Summary

• Inline styles → Tailwind utilities: Converted all 78 style={{}} attributes to Tailwind classes across 72 files (UI primitives, layout, navigation, views, modals)
• CSS layer ordering fix: Moved custom CSS reset (* { padding: 0; margin: 0 }) into @layer base — unlayered styles were overriding Tailwind utilities, causing all padding/margin to be stripped
• Theme switch snap-back fix: Removed currentThemeId from the profile-sync useEffect dependency array in App.tsx — it was causing a snap-back loop when changing themes in Settings
• Expanded @theme token map: Added missing color, status, ring, border, and shadow tokens (61 → full coverage)
• Logger abstraction: New lib/logger.ts replacing raw console.* calls
• Centralized constants: New lib/constants.ts for delay/timeout/interval values
• Security hardening: Added targetOrigin to all postMessage calls, removed as any casts
• Component optimization: Extracted static objects/arrays to module scope with as const

Test plan

• Run pnpm typecheck — passes clean
• Run pnpm build — builds successfully
• Launch desktop app (pnpm dev:desktop) — verify dashboard layout renders correctly with proper padding, headers, sidebar spacing
• Switch themes in Settings → verify no snap-back/flash, immediate clean transition
• Switch between profiles with different themes → verify theme applies on profile change
• Test on dark and light themes
• Verify all views render correctly (Dashboard, Profiles, Stream Manager, Encoder Settings, Output Groups, Stream Targets, Logs, Settings, Integrations, Chat)