feat(gui): make a copy and copy to another folder in My files

The entry menu gains Make a Copy, which copies an item next to itself, and
Copy To…, which reuses the move folder picker limited to My files; Copy
To… is also in the selection menu. Both send Request::Copy, so the copy is
made on Proton Drive.

The move and copy reports share one request loop. Docs describe the new
actions, and the changelog notes that saved public links now show their
names once the SDK decrypts them.

docs/CHANGELOG.md

@@ -19,10 +19,12 @@ scratch (user data in `staging/` and `recovery/` is never touched by this).
   the app asks GitHub once a day and shows a banner with a **Download** button when a newer
   version is out. It is off by default, and not offered for packages that a package manager
   updates (COPR, the AUR, Nix) (#42).
-- **`pdfs copy` copies files and folders on Proton Drive**, without downloading or uploading
-  them: `pdfs copy ~/ProtonDrive/report.pdf ~/ProtonDrive/Archive`. A folder is copied with
-  everything in it, and a name already taken gets a " (1)" suffix. A file or folder with changes
-  that have not synced yet is refused until they have.
+- **Copy files and folders on Proton Drive**, without downloading or uploading them. In My files,
+  right-click an item and choose **Make a Copy** to copy it next to itself, or **Copy To…** to pick
+  another folder; **Copy To…** also works on a selection. From a terminal:
+  `pdfs copy ~/ProtonDrive/report.pdf ~/ProtonDrive/Archive`. A folder is copied with everything
+  in it, and a name already taken gets a " (1)" suffix. A file or folder with changes that have
+  not synced yet is refused until they have.
 
 ### Changed
 - **Reorganised documentation, now also on the
@@ -33,6 +35,13 @@ scratch (user data in `staging/` and `recovery/` is never touched by this).
   Installation puts the COPR repository first for Fedora and explains updating and uninstalling
   for each kind of package. Each release publishes `docs/` to the wiki.
 
+### Fixed
+
+- **Saved public links show the name of what they point at**, in the app and in `pdfs bookmarks`,
+  instead of "Shared link". For a link with a custom password, the address no longer has the custom
+  password stuck to its end, so it matches the link the web shows and the page asks for the
+  password.
+
 ## [3.5.0] — 2026-10-16
 
 Schema: **44**. Queued changes get an index by kind and name, and each synced file remembers the