chore: clean up lint/type issues and tighten comment media URL validation

lib/api-response.ts

@@ -126,7 +126,7 @@ export function successResponse<T>(
   return NextResponse.json(body, { status });
 }
 
-export function withCacheControl<T>(response: Response, value: string): Response {
+export function withCacheControl(response: Response, value: string): Response {
   response.headers.set('Cache-Control', value);
   return response;
 }

lib/db.ts

@@ -26,7 +26,7 @@ function createPool(connectionString: string): Pool {
   const pool = new Pool(poolConfig);
 
   // Add error handling for pool errors
-  pool.on('error', (err, client) => {
+  pool.on('error', (err) => {
     console.error('Unexpected database pool error:', err.message);
     // Don't crash the app on unexpected pool errors
   });

lib/r2.ts

@@ -1,4 +1,4 @@
-import { S3Client, PutObjectCommand, GetObjectCommand } from '@aws-sdk/client-s3';
+import { S3Client, PutObjectCommand } from '@aws-sdk/client-s3';
 
 const R2_ACCOUNT_ID = process.env.R2_ACCOUNT_ID!;
 const R2_ACCESS_KEY_ID = process.env.R2_ACCESS_KEY_ID!;

lib/video-providers/bunny.ts

@@ -1,4 +1,4 @@
-import type { VideoProvider, VideoMetadata, EmbedOptions, ThumbnailSize } from './types';
+import type { VideoProvider, VideoMetadata, EmbedOptions } from './types';
 import { getCachedMetadata, setCachedMetadata } from './metadata-cache';
 
 // Bunny Stream URL patterns
@@ -43,8 +43,7 @@ export const bunnyProvider: VideoProvider = {
         return `https://iframe.mediadelivery.net/embed/${libraryId}/${videoId}?${params.toString()}`;
     },
 
-    getThumbnailUrl(videoId: string, size: ThumbnailSize = 'medium'): string {
-        const libraryId = process.env.NEXT_PUBLIC_BUNNY_STREAM_LIBRARY_ID || process.env.BUNNY_STREAM_LIBRARY_ID || '0';
+    getThumbnailUrl(videoId: string): string {
         // Bunny stream thumbnails: https://vz-uuid.b-cdn.net/{videoId}/thumbnail.jpg
         // Since we don't have the b-cdn pull zone readily available in pure abstract,
         // we should rely on fetching metadata for actual thumbnails, OR construct via API

lib/video-providers/direct.ts

@@ -1,4 +1,4 @@
-import type { VideoProvider, VideoMetadata, EmbedOptions, ThumbnailSize } from './types';
+import type { VideoProvider, VideoMetadata, EmbedOptions } from './types';
 
 // Direct video URL patterns (for future self-hosted videos)
 const DIRECT_VIDEO_PATTERNS = [
@@ -49,7 +49,8 @@ export const directProvider: VideoProvider = {
     return `${videoId}${queryString ? `#t=${options.startTime}` : ''}`;
   },
 
-  getThumbnailUrl(videoId: string, size: ThumbnailSize = 'medium'): string {
+  getThumbnailUrl(videoId: string): string {
+    void videoId;
     // For direct uploads, thumbnail would be generated server-side
     // Return a placeholder for now
     return '/placeholder-video-thumbnail.png';

lib/video-providers/youtube.ts

@@ -84,7 +84,7 @@ export const youtubeProvider: VideoProvider = {
 
       setCachedMetadata(cacheKey, metadata);
       return metadata;
-    } catch (error) {
+    } catch {
       // Fallback with minimal data
       const fallback: VideoMetadata = {
         title: 'YouTube Video',