ci: fix lint errors for CI

- Fix noImplicitAnyLet: add type to let match variable
- Fix noAssignInExpressions: use matchAll() + for-of instead of while
- Suppress useExhaustiveDependencies in mascot scroll effect
- Suppress useSemanticElements for message card click handler

biome.json

@@ -14,12 +14,12 @@
       "packages/**/*.ts",
       "*.json",
       "*.ts",
-      "!vendor/**",
-      "!.claude/**",
-      "!services/**/dist/**",
-      "!packages/**/dist/**",
-      "!services/**/.next/**",
-      "!services/**/out/**"
+      "!vendor",
+      "!.claude",
+      "!services/**/dist",
+      "!packages/**/dist",
+      "!services/**/.next",
+      "!services/**/out"
     ]
   },
   "formatter": {