feat(gui,fuse,core): share photos, copy image, thumbnail strip in the viewer

- Share… in the grid's photo menu and the viewer's ⋮ menu opens the Share
  dialog by uid. The daemon accepts a uid from the Photos timeline for
  sharing (resolve_shareable), since the photos volume is in no mount.
  Photos in an album someone else shared are not offered.
- Copy Image (Ctrl+C) puts the shown still on the clipboard. The viewer
  has its own toast overlay, so this and Save a Copy confirm over it
  instead of behind it.
- A thumbnail strip along the viewer's bottom edge, on the gallery model,
  marks the shown photo and jumps on click. Several pictures can now
  wait for one thumbnail, so the strip and the grid tile don't steal it
  from each other.
- PhotoItem carries place_id (serde default); the line under the
  viewer's title reads "Berlin · 12 of 340".

docs/CHANGELOG.md

@@ -79,6 +79,15 @@ Existing folders stay device backups. Older builds cannot open the upgraded data
   the grid to the photo it was showing. Alt+Left and Backspace go back a level in Shared with me
   and Computers and leave an open album or place in Photos, as Escape does too.
 
+- **Share photos, and more in the photo viewer.**
+  - **Share…** in a photo's menu and in the viewer's ⋮ menu opens the usual Share dialog: invite
+    people or make a public link. It is not offered for a photo in an album someone else shared.
+  - **Copy Image** (Ctrl+C) puts the photo on screen on the clipboard.
+  - A strip of thumbnails along the bottom of the viewer shows the photos around the one on
+    screen; click one to jump to it. It fades with the other controls and stays hidden during a
+    slideshow.
+  - The line under the date names the town the photo was taken in, when it is known.
+
 ### Changed
 
 - **`proton-sdk` and `proton-drive-rs` 0.11.0.** Timestamps are converted where they enter