feat(tui): support multiple clipboard images in attachment bar

[espinosacodes]

Closes espinosacodes#1

Summary

Extends TUI clipboard attachment to support multiple files/images at once, matching existing multi-file support for path paste and GUI file picker.

Previously:

• File paths: multi-file via parse_image_paths + process_paths (space-separated, e.g. one.png two.jpg) already worked
• GUI: FilePickerConfiguration::allow_multi_select() at app/src/editor/view/mod.rs:5047 already allowed multiple selection
• Clipboard: only first supported image was attached, silently dropping the rest

Now clipboard attaches all supported images in order, validated against MAX_IMAGE_COUNT_FOR_QUERY (20).

Changes

• crates/warp_tui/src/attachment_bar/image_processing.rs:152: add process_clipboard_contents(content) -> Result<Vec<ImageContext>> that filters by CLIPBOARD_IMAGE_MIME_TYPES and processes each image; keep process_clipboard_content as single-image wrapper
• crates/warp_tui/src/attachment_bar/model.rs:279: update attach_clipboard_image to count supported clipboard images, validate against limit, show combined indicator ("2 clipboard images" for multi), and append all via append_pending_images
• crates/warp_tui/src/attachment_bar/image_processing_tests.rs:163: add tests processes_multiple_clipboard_images_in_order and filters_unsupported_clipboard_images
• docs/multi-file-attach-demo.png: demo screenshot showing Warp tabs (Notifications setup instructions, /remote-control, File explorer, Rich Input)

How to test locally

# 1. Accept Xcode license if needed (macOS)
sudo xcodebuild -license accept

# 2. Run TUI or GUI from this branch
git clone https://github.com/espinosacodes/warp.git
cd warp
git checkout feature/multi-file-attach-support

# GUI
./script/run

# TUI headless
./script/run-tui

# Tests (once license accepted)
cargo nextest run -p warp_tui --lib attachment_bar::image_processing::tests
# expect:
# - processes_multiple_clipboard_images_in_order ok
# - filters_unsupported_clipboard_images ok

Manual TUI check:

1. Copy 2 PNGs to clipboard, trigger paste_from_clipboard, verify attachment bar shows count 2 and navigation works.
2. Paste one.png two.jpg as text, verify both processed in order.
3. Attach 20 images then paste one more, expect hint: "Image attachment limit is 20 per query."
4. Clipboard with 1 PNG + 1 TIFF, only PNG should attach.

Notes

Fork branch espinosacodes:feature/multi-file-attach-support contains the same commit as this PR. Tested locally after Xcode license accept, CI should pass.

Skipped: per-image error reporting and drag-drop overlay, add when needed.

---

CHANGELOG-IMPROVEMENT: TUI attachment bar now supports pasting multiple clipboard images at once.

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[warp-for-oss]

@espinosacodes

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Next step: open or find a same-repo issue describing this change, then link it to this PR by adding Closes #123 to the PR description (or using the "Development" sidebar on GitHub). A maintainer will mark the issue ready-to-implement when it is ready. Once it is marked, comment /warp-agent-review to re-trigger review.

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[warp-for-oss]

@espinosacodes

Every PR must be linked to a same-repo issue before Oz can review it.

Next step: open or find a same-repo issue describing this change, then link it to this PR by adding Closes #123 to the PR description (or using the "Development" sidebar on GitHub). A maintainer will mark the issue ready-to-implement when it is ready. Once it is marked, comment /warp-agent-review to re-trigger review.

See the contribution guidelines for the full readiness model.

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