feat: replace history placeholder with shared activity store

[legend-esc]

Summary

Replace the /history placeholder ("History coming soon") with a functional activity history page backed by the shared activityStore.

Changes

• src/pages/History.tsx: rewrote to read entries from useActivityStore, render each via ActivityRow, and support empty/pending/failed/confirmed states with chain/type/status filters.
• src/stores/activityStore.ts: added clearAll() to clear all history entries.
• src/App.tsx: routed /history to History (previously shared the Activity page).

Details

• Renders chain, status, amount, timestamp, and explorer links per entry.
• Supports empty, pending, failed, and confirmed states.
• Exports (CSV/JSON) deliberately omit metadata so private key/memo material is never exposed.

Verification

• tsc --noEmit: clean
• prettier --check: clean
• vitest run: 338/338 passing
• vite build: passing

Closes #218

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[truthixify]

This regresses the privacy scoping already present in Activity.tsx. The new History page reads and renders every persisted entry without requiring a connected wallet or filtering by entry.wallet, and its exportEntries value is built from all entries rather than filteredEntries. Switching wallets can therefore reveal and export another wallet/profile's history. Reuse the existing Activity page or preserve its connected-wallet scope, export only the filtered scoped entries after removing metadata, and add cross-wallet isolation tests.