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/models/Recipe.ts

@@ -175,4 +175,6 @@ const RecipeSchema = new mongoose.Schema(
 RecipeSchema.index({ "translations.en.short_name": 1 });
 RecipeSchema.index({ "translations.en.translationStatus": 1 });
 
-export const Recipe = mongoose.model("Recipe", RecipeSchema);
+let _recipeModel: any;
+try { _recipeModel = mongoose.model("Recipe"); } catch { _recipeModel = mongoose.model("Recipe", RecipeSchema); }
+export const Recipe = _recipeModel as mongoose.Model<any>;

src/models/RecurringPayment.ts

@@ -93,7 +93,7 @@ const RecurringPaymentSchema = new mongoose.Schema(
     cronExpression: {
       type: String,
       validate: {
-        validator: function(value: string) {
+        validator: function(this: any, value: string) {
           // Only validate if frequency is custom
           if (this.frequency === 'custom') {
             return value != null && value.trim().length > 0;

src/models/RosaryStreak.ts

@@ -9,4 +9,7 @@ const RosaryStreakSchema = new mongoose.Schema(
   { timestamps: true }
 );
 
-export const RosaryStreak = mongoose.models.RosaryStreak || mongoose.model("RosaryStreak", RosaryStreakSchema);
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+let _model: any;
+try { _model = mongoose.model("RosaryStreak"); } catch { _model = mongoose.model("RosaryStreak", RosaryStreakSchema); }
+export const RosaryStreak = _model as mongoose.Model<any>;