fix(core,fuse,gui): UI/UX quick wins from the audit (phase 0)

- Move Google Takeout import out of Settings; Photos owns it, and the
  Takeout page's back button returns there.
- Trash from the file browser is Undo-only (no confirm); F2 on a
  multi-selection explains why it does nothing.
- Ask before sign-out, rejecting an invitation, removing someone's access,
  removing a public link, and switching a folder to on-demand.
- Clearer offline wording ("Make available offline" / "Make online only")
  with dedicated offline, online-only and upload symbolic icons; the pin row
  is hidden for folders.
- Search hits report whether a file is cached, so search results show the
  offline badge.
- Activity log: readable Empty Trash / link entries, distinct icons, and
  error/warning styling for failures and conflicts.
- Proper singular/plural counts instead of "item(s)" / "archive(s)".
- Name earlier versions by save time instead of revision id; capitalise
  the public link role; stop-syncing uses a stop icon, not a trash can.
- Label the Photos Upload and "Show on map" buttons; toast when a
  thumbnail build finishes; the versions button follows the mount state.
- Mode switches and device mutations reload both sync pages.

crates/pdfs-gui/src/app/pages/devices.rs

@@ -43,9 +43,10 @@ pub(crate) struct DevicesWidgets {
     pub(crate) refresh: gtk4::Button,
 }
 
-/// The Computers page: a "This computer" section listing the local folders synced
-/// to this machine's device (each row offering a mode toggle and Remove), plus an
-/// "Other devices" section listing the account's other registered devices.
+/// The Computers page: a "This computer" section naming the device this machine
+/// backs up to (renamable from its header), plus an "Other computers" section
+/// listing the account's other registered devices. The synced folders
+/// themselves live on the Locations page.
 pub(crate) fn build_devices_page() -> (gtk4::Widget, DevicesWidgets) {
     let title = gtk4::Label::builder()
         .label("Computers")
@@ -588,7 +589,7 @@ fn show_restore_picker(ui: &Rc<Ui>, items: Vec<RestorableFolder>) {
 /// Flip a synced folder between `mirror` and `ondemand`. Reloads after so the
 /// row's subtitle and switch reflect the daemon's real state (the request may be
 /// rejected, e.g. switching to on-demand while a folder is mid-sync).
-pub(crate) fn set_sync_folder_mode(ui: &Rc<Ui>, id: i64, mode: &str) {
+pub(crate) fn set_sync_folder_mode(ui: &Rc<Ui>, id: i64, mode: &'static str) {
     let rx = spawn_request(
         ui.dirs.control_socket(),
         Request::SetSyncFolderMode {
@@ -599,7 +600,17 @@ pub(crate) fn set_sync_folder_mode(ui: &Rc<Ui>, id: i64, mode: &str) {
     let ui = ui.clone();
     glib::spawn_future_local(async move {
         match rx.recv().await {
-            Ok(Ok(Response::Ok { message })) => toast(&ui, &message),
+            // The daemon's own text is written for the log; the toast says what
+            // the person will see happen. A switch may be queued behind a running
+            // pass, hence "will".
+            Ok(Ok(Response::Ok { .. })) => toast(
+                &ui,
+                if mode == "ondemand" {
+                    "Folder will switch to on-demand"
+                } else {
+                    "Folder will download and stay synced"
+                },
+            ),
             Ok(Ok(Response::Error { message, kind })) => {
                 toast_failure(&ui, "Couldn't change mode", &message, kind)
             }
@@ -609,12 +620,22 @@ pub(crate) fn set_sync_folder_mode(ui: &Rc<Ui>, id: i64, mode: &str) {
                 "The mount service didn't respond.",
             ),
         }
-        if ui.stack.visible_child_name().as_deref() == Some("devices") {
-            load_devices(&ui);
-        }
+        reload_sync_pages(&ui);
     });
 }
 
+/// Repaint whichever of the two pages that show sync folders is on screen. Sync
+/// folder changes are raised from Locations as well as Computers, and both must
+/// show the daemon's answer at once rather than on the next tick — a rejected
+/// mode switch would otherwise stay visibly flipped.
+pub(crate) fn reload_sync_pages(ui: &Rc<Ui>) {
+    match ui.stack.visible_child_name().as_deref() {
+        Some("devices") => load_devices(ui),
+        Some("locations") => refresh_locations(ui),
+        _ => {}
+    }
+}
+
 /// Confirm, then stop syncing a folder. Offers to also delete the cloud copy.
 pub(crate) fn prompt_remove_sync_folder(ui: &Rc<Ui>, id: i64, path: &str, ondemand: bool) {
     let win = ui_window(ui);
@@ -790,7 +811,7 @@ pub(crate) fn prompt_adopt_device(ui: &Rc<Ui>, uid: &str, name: &str) {
     dialog.present(win.as_ref());
 }
 
-/// Run a mutation raised from the Devices page and reload the page on success.
+/// Run a mutation raised from Computers or Locations and reload the page on success.
 pub(crate) fn run_devices_mutation(
     ui: &Rc<Ui>,
     req: Request,
@@ -806,7 +827,7 @@ pub(crate) fn run_devices_mutation(
         ui.busy_end();
         match result {
             Ok(Ok(Response::Ok { .. })) => {
-                load_devices(&ui);
+                reload_sync_pages(&ui);
                 toast(&ui, &done);
             }
             Ok(Ok(Response::Error { message, kind })) => toast_failure(&ui, failed, &message, kind),