fix(core,fuse,gui): a photo upload the SDK refuses no longer says offline

Every SDK error that was not an API reply was classified as Offline.
Only a transport failure is. An upload on an account without a photo
library fails in the SDK before any request, and the app said "You're
offline" while every other call worked (issue #38).

Classify by variant: Transport is Offline, InvalidOperation is Invalid,
Serialization is Remote, Crypto and KeysLocked are Internal. The daemon
logs a failed photo upload, and the Photos page greys out Upload when
the account has no photo library.

docs/BUGS.md B205.

crates/pdfs-gui/src/app/main.rs

@@ -538,6 +538,7 @@ fn build_window(app: &adw::Application) {
             reload_pending: Cell::new(false),
             loading: Cell::new(false),
             has_more: Cell::new(false),
+            library: Cell::new(true),
             page_waiters: RefCell::new(Vec::new()),
             width: Cell::new(0),
             photo_tex: RefCell::new(HashMap::new()),

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

@@ -140,6 +140,9 @@ pub(crate) struct GalleryState {
     pub(crate) loading: Cell<bool>,
     /// Whether the last page came back full, so there may be more to load.
     pub(crate) has_more: Cell<bool>,
+    /// Whether the account has a photo library. Until the daemon says it has
+    /// none, assume it does, so Upload is not greyed out while the page loads.
+    pub(crate) library: Cell<bool>,
     /// Run once the page in flight has landed in [`Self::model`] — how the
     /// lightbox steps past the last loaded photo.
     pub(crate) page_waiters: RefCell<Vec<Box<dyn FnOnce()>>>,
@@ -3341,6 +3344,12 @@ pub(crate) fn load_gallery(ui: &Rc<Ui>, append: bool) {
                 items,
                 counts,
             })) => {
+                // Nothing can go into a library the account does not have; the
+                // SDK refuses the upload before sending it (issue #38).
+                ui.gallery.library.set(available);
+                ui.gallery
+                    .upload
+                    .set_sensitive(available && *ui.mounted.borrow());
                 if !available {
                     gallery_status(
                         &ui,

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

@@ -958,7 +958,9 @@ fn quota_display(max_space: i64, used_space: i64) -> (f64, String) {
 pub(crate) fn set_mounted(ui: &Rc<Ui>, mounted: bool) {
     *ui.mounted.borrow_mut() = mounted;
     sync_mounted_actions(ui, mounted);
-    ui.gallery.upload.set_sensitive(mounted);
+    ui.gallery
+        .upload
+        .set_sensitive(mounted && ui.gallery.library.get());
     ui.details.details.pin_row.set_sensitive(mounted);
     ui.details.details.rename_button.set_sensitive(mounted);
     ui.details.details.trash_button.set_sensitive(mounted);