refactor: smart CSV import/export with templates, auto-detection, and review UI

Import flow:
- Add parseCSVRaw() to csv.ts for relaxed CSV parsing (no required columns)
- Add action templates (trade, cancel, withdraw, deposit, transfer, wait)
  mirroring ActionsDAGParserParams from actions_dag_parser.py
- Add smart column detector with regex value patterns (crypto addresses,
  trading pairs, amounts) and fuzzy header matching
- Rewrite ImportTask as 3-step flow: Upload -> Column Mapping -> Review
- Auto-detect best action template per row, allow user to change
- Color-coded confidence badges on auto-matched parameters

Export flow:
- Add ExportResultsDialog with template-based table view
- Pre-defined templates (General, Trade, Transfer, Full Details)
- User can add custom columns by selecting discovered JSON paths
- Sort/filter on any column via @tanstack/react-table
- Column visibility toggles
- Export filtered/sorted data as CSV

Tests:
- Add vitest with 71 tests covering action templates, column detector,
  CSV parsing, JSON path utilities, and export templates

https://claude.ai/code/session_014uGX2qb5mYMuMKVUY4Z6Az

Author: claude

.gitignore

@@ -4,6 +4,9 @@ __pycache__/
 *$py.class
 *.orig
 
+# Node
+node_modules/
+
 # C extensions
 *.so