Improve error handling and navigation safety across the application

Add robust error handling for image uploads, improve navigation logic in AutocompleteSearch with toast notifications for missing identifiers, refine useIsMobile hook return type, and update Supabase function error reporting to handle non-Error types.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: a759d451-40bf-440d-96f5-a19ad6af18a8
Replit-Commit-Checkpoint-Type: intermediate_checkpoint

supabase/functions/process-selective-approval/index.ts

@@ -230,7 +230,7 @@ serve(async (req) => {
           itemId: item.id,
           itemType: item.item_type,
           success: false,
-          error: error.message
+          error: error instanceof Error ? error.message : 'Unknown error'
         });
       }
     }
@@ -261,7 +261,7 @@ serve(async (req) => {
   } catch (error) {
     console.error('Error in process-selective-approval:', error);
     return new Response(
-      JSON.stringify({ error: error.message }),
+      JSON.stringify({ error: error instanceof Error ? error.message : 'Unknown error' }),
       { status: 500, headers: { ...corsHeaders, 'Content-Type': 'application/json' } }
     );
   }