feat: show image previews inside terminal panes

[teamleaderleo]

What changed

Image-only Cmd+V pastes now show a cmux-owned preview card inside the terminal pane before the paste is consumed. This keeps Codex and Claude Code's existing attachment behavior intact while making the image visible where the user is composing; other terminal harnesses get the same behavior automatically.

Clicking the card opens a larger popover preview. A close button dismisses it, the card follows the terminal input cursor during pane geometry changes, and accessibility labels are localized for all supported macOS locales.

This stacks on #14948 (feat/image-paste-ctrl-v-agents), which provides the optional Codex/Claude Ctrl+V routing.

Validation

• git diff --check
• python3 scripts/localization_catalog.py check --root .
• Swift syntax and focused local verification were completed before the request to stop compiling on the MacBook Air.
• No Xcode, Swift compiler, app launch, restart, or build was run after that request.

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Summary by cubic

Image-only Cmd+V pastes now show a preview card inside the terminal pane before the paste is consumed. Codex and Claude Code's existing attachment behavior is unchanged, and other terminal harnesses get this behavior automatically.

The card is an AppKit overlay rather than terminal output, so scrollback, selection, and the agent's [Image #N] placeholder stay untouched. Clicking the card opens a larger popover preview, and a close button dismisses it. The card follows the terminal input cursor during pane geometry changes, and accessibility labels are localized for all supported macOS locales.

This stacks on #14948 (feat/image-paste-ctrl-v-agents), which provides the optional Codex/Claude Ctrl+V routing.

^{Written for commit fc17be7. Summary will update on new commits.}

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[github-actions]

CI failure attribution

CI failed on fc17be713b (run 36684635190 attempt 1): 1 unknown.

Job	Verdict	Why
macos / macOS compile admission	unknown	no known signature; failed step: Validate Swift warning budget

Not re-run automatically: macos / macOS compile admission is not a machine failure.

Written by scripts/ci/classify_failures.py (ci-failure-attribution.yml); signatures are its SIGNATURES table. A machine verdict is the runner's fault, not this PR's.

[teamleaderleo]

Migrated to upstream PR #15846 so the work and CI run directly in manaflow-ai/cmux. The fork PR is superseded.

[teamleaderleo]

Superseded by upstream PR #15846.