fix: satisfy deploy lint gate for S3 compatibility work

- Apply Biome organize-import/formatting fixes across changed S3 files
- Replace remaining string concatenations with template literals for lint
- Make home page inline handlers explicit via window.* and add button types
- Clean S3 auth lint issues with dot-property access and optional chaining
- Keep GetObject proxy and production/S3 SDK tests passing

Verification:
- bun run lint (0 errors, 1 CSS specificity warning)
- S3_SECRET_KEY=<env> bun test test/production-e2e.test.ts (29 pass)
- S3_SECRET_KEY=<env> bun test test/s3-sdk.test.ts (20 pass)
- bun test test/s3-auth.test.ts (5 pass)

src/db/files-ext.ts

@@ -1,4 +1,4 @@
-import { eq, and, sql } from 'drizzle-orm';
+import { and, eq, sql } from 'drizzle-orm';
 import { db, files as fileSchema } from './index';
 import type { File } from './schema';
 
@@ -62,7 +62,7 @@ export const listObjectsByPrefix = async (
   maxKeys: number,
   startAfter: string | null,
 ): Promise<{ objects: S3FileRecord[]; prefixes: string[] }> => {
-  let query = sql`SELECT * FROM files WHERE bucket_id = ${bucketId}::uuid AND is_deleted = false AND s3_key LIKE ${prefix + '%'}`;
+  let query = sql`SELECT * FROM files WHERE bucket_id = ${bucketId}::uuid AND is_deleted = false AND s3_key LIKE ${`${prefix}%`}`;
 
   if (startAfter) {
     query = sql`${query} AND s3_key > ${startAfter}`;