feat(app): add native file image actions

[dwyanewang]

Linked issue

Follow-up to #4032.

Type of change

• Bug fix
• New feature
• Enhancement
• Refactor
• Docs

Reasoning

Image files can now be previewed and zoomed in place, but on mobile the preview does not expose the image actions users need to move the result into another workflow. A user currently has to leave the preview and find another route to copy, save, or share the image.

File previews are child tabs of the session that opened them. The compact header also needs a direct close action so a user can leave the preview and return to that parent session without opening the tab switcher.

This change adds the native image actions and the compact file-preview close path without replacing the shared zoom viewport.

Goals

• Open image actions by long-pressing a native file preview
• Copy the image to the clipboard
• Save the image to the photo library with add-only permission
• Share the cached image through the platform share sheet
• Show pending, success, permission-denied, and failure feedback
• Show a compact close button for the active file tab
• Return to the parent session when the file preview closes
• Preserve the upstream preview and zoom behavior

Non-goals

• Reimplement image preview, pan, or zoom
• Add image actions to browser or Electron previews
• Change attachment preview lifecycle, retries, or garbage collection
• Change navigation for agent, terminal, browser, or other non-file tabs
• Change the file explorer download flow

QA

Automated checks:

$ npx vitest run packages/app/src/file-pane/image-preview-save.test.ts --bail=1

 Test Files  1 passed (1)
      Tests  3 passed (3)
   Duration  474ms

$ npx vitest run packages/app/src/i18n/resources.test.ts --bail=1

 Test Files  1 passed (1)
      Tests  36 passed (36)
   Duration  5.36s

$ npm run test --workspace=@getpaseo/app -- src/stores/workspace-layout-store.test.ts -t "closing a focused child tab returns to its parent before using tab-strip order" --bail=1

 Test Files  1 passed (1)
      Tests  1 passed | 122 skipped (123)
   Duration  23.28s

$ env -u PASEO_PASSWORD npm run test:e2e --workspace=@getpaseo/app -- e2e/browser/file-editing.spec.ts --grep "closes a compact file preview back to its parent session"

  ✓  1 [browser] › e2e/browser/file-editing.spec.ts › closes a compact file preview back to its parent session (19.2s)

  1 passed (1.7m)

PASEO_PASSWORD is removed for this command because the isolated E2E daemon inherits the parent environment; leaving a local daemon password set enables authentication that the seed client does not use.

The pre-commit hook ran the repository checks against the committed change:

summary: (done in 45.37 seconds)
✓ format (0.91 seconds)
✓ lint (1.20 seconds)
✓ typecheck (45.33 seconds)

Platform coverage:

Platform	Tested	Notes
iOS	No	No iOS environment is available on this Linux host
Android	Yes	Android visual and interaction QA confirms the layout, zoom controls, Copy/Save/Share actions, compact close button, and return to the parent session
Web	Yes	Compact browser E2E opens an image file, shows the close action, closes it, and returns to the parent session
Desktop macOS	No	Native actions are not included
Desktop Windows	No	Native actions are not included
Desktop Linux	No	Native actions are not included

Android visual and interaction QA is complete for the current PR commit. iOS remains untested because no iOS environment is available on this Linux host; this gap is reported for review.

Checklist

• One focused change
• npm run typecheck passes
• npm run lint passes
• npm run format passes
• QA evidence
• Tests added or updated where it made sense

[dwyanewang]

Android visual and interaction QA for commit 956b2e3c1: compact image preview in dark mode with zoom controls, the native long-press Copy/Save/Share menu, and the compact close action.

Manual Android QA confirmed that Copy, Save, and Share complete successfully, and that closing the compact preview returns to the parent session.

[boudra]

Closing this feature PR. Please discuss the workflow and shared need in Discussions, following CONTRIBUTING.md.

[dwyanewang]

Understood, thanks. Opened the workflow discussion for the image actions: #4534.

Leaving this closed. If the discussion gains interest I'll reopen a narrower PR covering only the image actions — the compact close action is a separate concern and shouldn't have been bundled here.