feat: add recently viewed snippets dashboard section #128

[Cashman-Exchange]

Overview

This PR adds a Recently Viewed Snippets section on the dashboard so users can quickly reopen snippets they opened earlier. History is persisted across sessions in localStorage, with a clear-history action and a graceful empty state.

Related Issue

Closes #128

Changes

🕒 Recently Viewed Persistence

• [ADD] lib/recent-snippets-storage.ts

  • Client-side localStorage history (codely_recent_snippets).
  • Dedupes by snippet id, keeps newest first, caps at 12 entries.
  • Supports record / read / clear with corrupt-payload safety.

• [ADD] lib/recent-snippets-storage.test.ts

  • Coverage for empty state, dedupe, max size, clear, and invalid storage payloads.

📊 Dashboard UI

• [ADD] app/dashboard/page.tsx

  • New dashboard page with quick links and the Recently Viewed section.

• [ADD] components/RecentlyViewedSnippets.tsx

  • Responsive card grid, relative “viewed” timestamps, click-to-reopen links (/snippets#id).
  • Empty state with browse CTA.
  • Clear history action.

🔗 View Tracking & Reopen

• [MODIFY] app/snippets/page.tsx

  • Restored the empty snippets page (required for reopen).
  • Records a recent view when a snippet is opened/edited.
  • Supports /snippets#id deep links from dashboard and collections.

• [MODIFY] app/collections/page.tsx

  • Records a recent view when using Collection View.

• [MODIFY] components/Sidebar.tsx

  • Adds Dashboard nav item; removes duplicate Collections entry.

• [MODIFY] components/WalletConnect.tsx

  • Removes orphaned duplicate code that prevented the app from compiling/booting.

Verification Results

npx jest lib/recent-snippets-storage.test.ts --testEnvironment=node --no-coverage
✅ 6/6 passed

Live acceptance check:
✅ /dashboard 200 — Recently Viewed section present
✅ /snippets 200 — reopen + view recording wired
✅ Empty state + Clear history available in client bundle
✅ Persistence smoke: record → reorder/dedupe → clear

Acceptance Criteria	Status
Visible on dashboard	✅ Recently Viewed section on /dashboard
Clickable entries	✅ Cards link to /snippets#id and reopen
Persistent history	✅ localStorage across sessions until cleared
Clear option available	✅ Clear history button
Graceful empty state	✅ Placeholder + browse CTA when empty

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