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/utils/imageValidation.ts

@@ -121,7 +121,7 @@ export async function validateImageFile(file: File): Promise<ValidationResult> {
 		console.error('[ImageValidation] Magic bytes validation error:', error);
 		return {
 			valid: false,
-			error: `Failed to validate file headers: ${error.message}`
+			error: `Failed to validate file headers: ${error instanceof Error ? error.message : String(error)}`
 		};
 	}
 
@@ -158,7 +158,7 @@ export async function validateImageFile(file: File): Promise<ValidationResult> {
 		console.error('[ImageValidation] Sharp validation error:', error);
 		return {
 			valid: false,
-			error: `Invalid or corrupted image file: ${error.message}`
+			error: `Invalid or corrupted image file: ${error instanceof Error ? error.message : String(error)}`
 		};
 	}
 
@@ -217,7 +217,7 @@ export async function validateImageBuffer(buffer: Buffer, filename: string): Pro
 	} catch (error) {
 		return {
 			valid: false,
-			error: `Failed to validate buffer headers: ${error.message}`
+			error: `Failed to validate buffer headers: ${error instanceof Error ? error.message : String(error)}`
 		};
 	}
 
@@ -241,7 +241,7 @@ export async function validateImageBuffer(buffer: Buffer, filename: string): Pro
 	} catch (error) {
 		return {
 			valid: false,
-			error: `Invalid or corrupted image buffer: ${error.message}`
+			error: `Invalid or corrupted image buffer: ${error instanceof Error ? error.message : String(error)}`
 		};
 	}
 

src/utils/recipeFormHelpers.ts

@@ -46,6 +46,7 @@ export interface RecipeFormData {
 		mediapath: string;
 		alt: string;
 		caption: string;
+		color?: string;
 	}>;
 
 	// Cake form

src/utils/translation.ts

@@ -459,8 +459,8 @@ class DeepLTranslationService {
 		const changed: string[] = [];
 
 		for (const field of fieldsToCheck) {
-			const oldValue = JSON.stringify(oldRecipe[field] || '');
-			const newValue = JSON.stringify(newRecipe[field] || '');
+			const oldValue = JSON.stringify((oldRecipe as any)[field] || '');
+			const newValue = JSON.stringify((newRecipe as any)[field] || '');
 			if (oldValue !== newValue) {
 				changed.push(field);
 			}