feat(edit): remove all links command and context menu (#539) (#1213)

* feat(edit): remove all links command and context menu (#539)

- Expose 'edit.remove_links' and 'edit.remove_all_links' commands to remove all links across the document or on specified pages.
- Add right-click context menu options for links: Properties, Delete, and Remove all links in both Link tool and Select tool modes.
- Extend automation tool 'links_remove' with optional 'pages' parameter and removal count.
- Add notification feedback in UI for link deletion.
- Mark 'edit.remove-all-links' as shipped in Parity with evidence tests.
- Add unit and integration tests covering automation, engine, and UI undo/redo.

* Remove all links: one command id, catalog rows, link menu only on a link

- Drop the duplicate edit.remove_all_links command (same label as the
  existing edit.remove_links, so it showed twice); edit.remove_links now
  runs remove_all_links with its toast.
- Add the toast strings (No links to remove, Removed 1 link, Removed {n}
  links) to all 20 catalogs.
- The canvas context menu shows the link items only when the right-click
  hit a link (LinkView::context, set per right-click), so a link left
  selected no longer takes over the comments menu, and the Link tool no
  longer replaces the comments menu away from links. Regression test.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Restore the PR's links_remove pages test (lost with the workdir conflict)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Brandon Thomas <echelon@gmail.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

crates/engine/src/tests.rs

@@ -2047,6 +2047,12 @@ fn links_from_urls_and_link_edits() {
     assert_eq!(d.links.len(), 1);
     assert_eq!(d.info.links.len(), 1, "the viewer follows it");
     assert!(s.find_urls(id).is_empty(), "already linked");
+    // Remove all links and undo.
+    s.apply(id, Edit::RemoveLinks { pages: None }).unwrap();
+    assert!(s.get(id).unwrap().links.is_empty());
+    assert_eq!(s.get(id).unwrap().can_undo(), Some("Remove all links"));
+    s.undo(id).unwrap();
+    assert_eq!(s.get(id).unwrap().links.len(), 1);
     // Link Properties and delete.
     let l = s.get(id).unwrap().links[0].clone();
     s.apply(id, Edit::SetLink { page: 0, index: l.index, rect: None, action: Some(LinkAction::Page(0)), style: None }).unwrap();