refactor: streamline deep link handling and improve sqlite worker initialization

- Simplified `DeepLinkHandler` logic by removing redundant return values and enhancing route parsing with `ifBlank()`.
- Refactored `sqlite.worker.js` for better modularity and error handling.
- Added helper methods for script imports and initialization error management.

Signed-off-by: Stefan Mogeritsch <stefan.mo.co@gmail.com>

frontend/core/navigation/src/commonMain/kotlin/at/mocode/frontend/core/navigation/DeepLinkHandler.kt

@@ -22,10 +22,11 @@ class DeepLinkHandler(
 
   fun handleDeepLink(url: String): Boolean {
     val parsed = parseDeepLink(url) ?: return false
-    return processDeepLink(parsed)
+    processDeepLink(parsed)
+    return true
   }
 
-  private fun processDeepLink(deepLink: DeepLink): Boolean {
+  private fun processDeepLink(deepLink: DeepLink) {
     val route = cleanRoute(deepLink.route)
 
     // If the route requires auth and the user is missing → redirect to log in
@@ -33,20 +34,19 @@ class DeepLinkHandler(
       val user = currentUserProvider.getCurrentUser()
       if (user == null) {
         navigation.navigateTo(config.loginRoute)
-        return true
+        return
       }
       // Admin section guard: requires ADMIN role
       if (requiresAdmin(route)) {
         val isAdmin = user.roles.contains(AppRoles.ADMIN)
         if (!isAdmin) {
           navigation.navigateTo(Routes.HOME)
-          return true
+          return
         }
       }
     }
 
     navigation.navigateTo(deepLink.route)
-    return true
   }
 
   private fun parseDeepLink(url: String): DeepLink? {
@@ -62,7 +62,7 @@ class DeepLinkHandler(
     val parts = withoutScheme.split("/")
     if (parts.isEmpty() || parts[0] != config.host) return null
     val path = "/" + parts.drop(1).joinToString("/")
-    val route = if (path.isBlank()) Routes.HOME else path
+    val route = path.ifBlank { Routes.HOME }
     return DeepLink(DeepLinkType.CUSTOM_SCHEME, route, url)
   }
 
@@ -86,7 +86,4 @@ class DeepLinkHandler(
   }
 
   private fun requiresAdmin(route: String): Boolean = route.startsWith("${Routes.Admin.ROOT}/")
-
-  fun generateDeepLink(route: String, useCustomScheme: Boolean = true): String =
-    if (useCustomScheme) "${config.scheme}://${config.host}$route" else "https://${config.allowedDomains.first()}$route"
 }