Transaction history UX improvements — pagination, activity panel, network labels

[premiumjibles]

Problem

"Show me my transactions" works end-to-end (117 tests passing, 10 networks) but has UX gaps:

tk ticket: sa-sjbv

Gaps

1. No persistent activity panel — history only available as inline chat tool response, not a dedicated tab
2. No pagination UX — server supports offset/limit but chat renders all at once (capped at 25)
3. Network label defaults to ethereum — tx.network is optional; when missing, UI shows "ethereum" even for Arbitrum/Base txs
4. Multi-chain errors not surfaced — error metadata exists but UI silently drops it
5. No free-text search (by tx hash, address, etc.)

Key Files

• apps/agentic-server/src/tools/transactionHistory.ts
• apps/agentic-server/src/lib/transactionHistory/fetcher.ts
• apps/agentic-chat/src/components/tools/GetTransactionHistoryUI.tsx
• apps/agentic-chat/src/lib/activityNormalizer.ts

Acceptance Criteria

• Transaction cards display correct network labels
• Pagination or "show more" exists for large result sets
• Network failures surfaced in UI
• Activity panel or persistent view accessible outside chat