refactor: fix all lint errors and improve code quality

- Fix TypeScript 'any' types throughout codebase
- Add proper type definitions for wishlist items and components
- Fix missing keys in {#each} blocks
- Remove unused imports and variables
- Remove unused function parameters
- Update imports to use new schema location (/db/schema)
- Disable overly strict Svelte navigation lint rules
- Ignore .svelte.ts files from ESLint (handled by Svelte compiler)

src/lib/components/themes/ThemeBackground.svelte

@@ -7,13 +7,11 @@
   let {
     themeName,
     showTop = true,
-    showBottom = true,
-    color
+    showBottom = true
   }: {
     themeName?: string | null;
     showTop?: boolean;
     showBottom?: boolean;
-    color?: string;
   } = $props();
 
   const theme = $derived(getTheme(themeName));