* fix(clipboard): preserve pinned state when editing entries
* fix(clipboard): address PR review feedback on editEntry
* fix(clipboard): validate empty text and entry size in EditEntry
* fix(clipboard): gate saving entry on full text load completion
* fix(clipboard): add user feedback and error fallback for entry loading
* fix(clipboard): keep entry and gate save with error toast on load failure
* fix(clipboard): reject non-text edits and add translator contexts
* fix(clipboard): support alt text mime types in EditEntry and UI guards
* fix(clipboard): pre-fetch entry before opening editor and allow retry on load failure
(cherry picked from commit 4141089e63)