fix(file-manager): persist folder and view in URL so refresh keeps current location

- Add updateUrlFromState() and call it from navigateToFolder and switchView
- Use goto(..., { replaceState: true }) with view and folderId query params
- Existing onMount already reads view and folderId from URL so refresh restores state

Author: coodos

platforms/file-manager/src/routes/(protected)/files/+page.svelte

@@ -705,8 +705,17 @@
         }
     }
 
+    function updateUrlFromState() {
+        const params = new URLSearchParams();
+        if (currentView === "shared") params.set("view", "shared");
+        if (currentFolderId) params.set("folderId", currentFolderId);
+        const query = params.toString();
+        goto(query ? `/files?${query}` : "/files", { replaceState: true });
+    }
+
     async function navigateToFolder(folderId: string | null) {
         currentFolderId = folderId;
+        updateUrlFromState();
         await loadFiles();
         await updateBreadcrumbs();
     }
@@ -715,6 +724,7 @@
         if (currentView === view) return; // Don't reload if already on this view
         currentView = view;
         currentFolderId = null; // Reset to root when switching views
+        updateUrlFromState();
         await loadFiles(); // Reload files when switching views
         await updateBreadcrumbs(); // Update breadcrumbs with correct root name
     }