feat(tui): Implement REAL blockchain search with indexed data

**CRITICAL FIX:** Search now actually searches local indexed data!

Previous implementation was just a UI shell with no backend.
Now searches WalletGraph nodes, TransferEvents, and TokenVolumes.

🔍 New Search Results Tab (Press '4'):
- Shows actual matches from locally indexed blockchain data
- Displays wallets with balances and transfer counts
- Shows token volumes and symbols
- Lists transactions with timestamps and amounts
- Match reasons explain why each result was found

🧠 Real Search Engine:
- search_indexed_data() method searches ALL local data:
  * WalletGraph.nodes_iter() for wallet matches
  * transfer_events for transaction matches
  * token_volumes for token symbol matches
- Fuzzy matching on addresses, labels, symbols, timestamps
- Returns SearchResultsData with categorized results

📊 Search Results Data Structures:
- SearchResultsData: query, entity_type, total_matches, timestamp
- WalletMatch: address, balance_sol, transfer_count, match_reason
- TransactionMatch: signature, timestamp, amount_sol, from/to, reason
- TokenMatch: symbol, volume, transfer_count, match_reason

⚡ Search Execution Flow:
1. User presses Ctrl+K, types query, selects suggestion
2. execute_search() calls search_indexed_data()
3. Searches WalletGraph, TransferEvents, TokenVolumes
4. Populates SearchResultsData with findings
5. Switches to SearchResults tab (Tab 4)
6. Displays categorized results with icons and stats

🎨 Search Results Tab UI:
- Header: query, entity type, match count, timestamp
- Wallets section: 👛 address, balance, transfers
- Tokens section: 🪙 symbol, volume
- Transactions section: 📜 signature, amount, timestamp
- Empty state with helpful hints
- Scrollable results
- Status bar with Ctrl+K reminder

🚀 Tab Navigation Updated:
- Tab 1: Dashboard
- Tab 2: Graph
- Tab 3: Logs
- Tab 4: Search Results (NEW)
- Press '4' or Tab through to access

Technical Implementation:
- Uses WalletGraph.nodes_iter() (respects private fields)
- Mutex-locked access to shared data structures
- Simplified transfer counting (future: use graph connections)
- Case-insensitive substring matching
- Results cloned from Arc<Mutex<>> for rendering

This transforms the search from cosmetic to functional.
Users can now actually find data in their local blockchain index!

🔧 Generated with Claude Code
Co-Authored-By: Claude <[email protected]>

Author: 0xrinegade