fix: resolve all 1008 svelte-check type errors across codebase

Add type annotations, JSDoc types, null checks, and proper generics
to eliminate all svelte-check errors. Key changes include:
- Type $state(null) variables to avoid 'never' inference
- Add JSDoc typedefs for plain <script> components
- Fix mongoose model typing with Model<any> to avoid union complexity
- Add App.Error/App.PageState interfaces in app.d.ts
- Fix tuple types to array types in types.ts
- Type catch block errors and API handler params
- Add null safety for DOM queries and optional chaining
- Add standard line-clamp property alongside -webkit- prefix

src/routes/api/generate-alt-text/+server.ts

@@ -57,22 +57,22 @@ export const POST: RequestHandler = async ({ request, locals }) => {
 
 		// Ensure translations.en.images array exists and has the right length
 		if (!recipe.translations) {
-			recipe.translations = { en: { images: [] } };
+			(recipe as any).translations = { en: { images: [] } };
 		}
-		if (!recipe.translations.en) {
-			recipe.translations.en = { images: [] };
+		if (!recipe.translations!.en) {
+			(recipe.translations as any).en = { images: [] };
 		}
-		if (!recipe.translations.en.images) {
-			recipe.translations.en.images = [];
+		if (!recipe.translations!.en!.images) {
+			(recipe.translations!.en as any).images = [];
 		}
 
 		// Ensure the en.images array has entries for all images
-		while (recipe.translations.en.images.length <= imageIndex) {
-			recipe.translations.en.images.push({ alt: '', caption: '' });
+		while (recipe.translations!.en!.images!.length <= imageIndex) {
+			recipe.translations!.en!.images!.push({ alt: '', caption: '' } as any);
 		}
 
 		// Update English alt text
-		recipe.translations.en.images[imageIndex].alt = altTextResult.en;
+		recipe.translations!.en!.images![imageIndex].alt = altTextResult.en;
 
 		// Save to database
 		await recipe.save();