feat: add SQLite database browser in FileNav

- New SqliteView component with table tabs, paginated data view
  (100 rows/page), SQL query editor (Cmd+Enter), NULL/BLOB formatting,
  sticky column headers, and dark mode
- Supports .db, .sqlite, .sqlite3, .db3 extensions
- Uses sql.js WASM served locally from /sql.js/sql-wasm.wasm
- Also fixes display_file handling when another file is already open

package.json

@@ -137,6 +137,7 @@
 		"shiki": "^4.0.1",
 		"socket.io-client": "^4.2.0",
 		"sortablejs": "^1.15.6",
+		"sql.js": "^1.14.1",
 		"svelte-sonner": "^0.3.19",
 		"tippy.js": "^6.3.7",
 		"turndown": "^7.2.0",