feat:fix: resolve issues #268, #269, #270, #271

[dominionvinson-maker]

#268 – ActivityFeed screen-reader announcement

• Implement debounced live-region announcement logic (1500 ms)
• Track previous item count via ref; skip initial snapshot
• Coalesce rapid arrivals into a single '1 new fill' / 'N new fills' message
• Add aria-live='polite' + aria-atomic='true' to the role='status' div
• Export ActivityFeedView for Storybook/test consumption
• Fix missing useTranslation import; remove duplicate ActivityFeed export
• Add activityFeed.* i18n keys to en.ts and es.ts

#269 – error.tsx boundaries for all route segments

• Add branded error.tsx to: / (root), /explore, /explore/[id], /solve, /solve/[address], /my-intents
• Each boundary logs the error, surfaces a message, and offers a 'Try again' button (reset) plus a context-appropriate back link

#270 – loading.tsx Suspense boundaries for all route segments

• Add loading.tsx to: / (home), /explore, /explore/[id], /solve, /solve/[address], /my-intents
• Reuse Skeleton primitives (SkeletonBlock, SkeletonCard, SkeletonDetailCard, SkeletonText) to match each page's layout

#271 – Light theme with prefers-color-scheme support

• Migrate all vx-* Tailwind color tokens to CSS variable references (var(--vx-ink), var(--vx-card), etc.) in tailwind.config.ts
• Define dark-mode variables on :root (existing palette, now default)
• Add @media (prefers-color-scheme: light) block with a full light palette: white/grey surfaces, adjusted sage/lavender for contrast, inverted text hierarchy
• Drive body background + radial gradients via variables
• Remove hardcoded bg-vx-ink text-vx-text from layout.tsx body
• Sync i18n catalogs: add highPriceImpactWarning to en.ts, add swap.destination.* + swap.quote.staleWarning to es.ts

Summary

Closes #

Changes

Testing

• npm run build passes
• npx tsc --noEmit passes
• npm test passes (or note any skipped/unrelated failures)

Checklist

• Self-reviewed the diff
• Added or updated tests for new behaviour
• No secrets or credentials committed
• PR title follows conventional commits (feat:, fix:, chore:, etc.)
  closes Fix ActivityFeed's missing screen-reader status announcement #268
  closes Add Next.js route-level error.tsx boundaries #269
  closes Add Next.js route-level loading.tsx boundaries #270
  closes Build a light theme with prefers-color-scheme support #271

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