fix: resolve all 58 TypeScript errors across codebase

- Add SvelteKit PageLoad/LayoutLoad/Actions types to recipe route files
- Fix possibly-undefined access on recipe.images, translations.en
- Fix parseFloat on number types in cospend split validation
- Use discriminated union guards for IngredientItem/InstructionItem
- Fix cache invalidation Promise<number> vs Promise<void> mismatch
- Suppress Mongoose model() complex union type error in WorkoutSession

src/lib/js/recipeJsonLd.ts

@@ -1,4 +1,4 @@
-function parseTimeToISO8601(timeString: string): string | undefined {
+function parseTimeToISO8601(timeString: string | undefined): string | undefined {
   if (!timeString) return undefined;
   
   // Handle common German time formats
@@ -66,7 +66,7 @@ export function generateRecipeJsonLd(data: RecipeModelType) {
       "name": "Alexander Bocken"
     },
     "datePublished": data.dateCreated ? new Date(data.dateCreated).toISOString() : undefined,
-    "dateModified": data.dateModified || data.updatedAt ? new Date(data.dateModified || data.updatedAt).toISOString() : undefined,
+    "dateModified": data.dateModified ? new Date(data.dateModified).toISOString() : undefined,
     "recipeCategory": data.category,
     "keywords": data.tags?.join(', '),
     "image": {
@@ -98,7 +98,7 @@ export function generateRecipeJsonLd(data: RecipeModelType) {
   // Extract ingredients
   if (data.ingredients) {
     for (const ingredientGroup of data.ingredients) {
-      if (ingredientGroup.list) {
+      if ('list' in ingredientGroup && ingredientGroup.list) {
         for (const ingredient of ingredientGroup.list) {
           if (ingredient.name) {
             let ingredientText = ingredient.name;
@@ -115,7 +115,7 @@ export function generateRecipeJsonLd(data: RecipeModelType) {
   // Extract instructions
   if (data.instructions) {
     for (const instructionGroup of data.instructions) {
-      if (instructionGroup.steps) {
+      if ('steps' in instructionGroup && instructionGroup.steps) {
         for (let i = 0; i < instructionGroup.steps.length; i++) {
           jsonLd.recipeInstructions.push({
             "@type": "HowToStep",

src/lib/server/cache.ts

@@ -312,7 +312,7 @@ export async function invalidateRecipeCaches(): Promise<void> {
  */
 export async function invalidateCospendCaches(usernames: string[], paymentId?: string): Promise<void> {
 	try {
-		const invalidations: Promise<void>[] = [];
+		const invalidations: Promise<unknown>[] = [];
 
 		// Invalidate balance and debts caches for all affected users
 		for (const username of usernames) {

src/lib/server/recipeHelpers.ts

@@ -32,17 +32,18 @@ export function briefQueryConfig(recipeLang: string) {
  */
 export function toBrief(recipe: RecipeModelType, recipeLang: string): BriefRecipeType {
 	if (isEnglish(recipeLang)) {
+		const en = recipe.translations?.en;
 		return {
 			_id: recipe._id,
-			name: recipe.translations.en.name,
-			short_name: recipe.translations.en.short_name,
+			name: en?.name ?? '',
+			short_name: en?.short_name ?? '',
 			images: recipe.images?.[0]
 				? [{ alt: recipe.images[0].alt, mediapath: recipe.images[0].mediapath, color: recipe.images[0].color }]
 				: [],
-			tags: recipe.translations.en.tags || [],
-			category: recipe.translations.en.category,
+			tags: en?.tags || [],
+			category: en?.category ?? '',
 			icon: recipe.icon,
-			description: recipe.translations.en.description,
+			description: en?.description,
 			season: recipe.season || [],
 			dateCreated: recipe.dateCreated,
 			dateModified: recipe.dateModified,