fix: resolve all lint errors — exclude generated dirs, auto-fix source

Exclude drizzle/ and .planning/ from Biome (generated files with
incompatible formatting). Auto-fix import ordering and formatting
in existing source files.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

biome.json

@@ -7,7 +7,7 @@
 	},
 	"files": {
 		"ignoreUnknown": false,
-		"includes": ["**", "!src/client/routeTree.gen.ts"]
+		"includes": ["**", "!src/client/routeTree.gen.ts", "!drizzle", "!.planning"]
 	},
 	"formatter": {
 		"enabled": true,