fix(tui): add plain text paste

[ametel01]

Issue for this PR

Closes #34006

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Adds a TUI plain-text paste command, prompt.paste_plain, bound to Ctrl+Alt+V. This reads clipboard text directly and inserts it into the prompt, bypassing the existing local image/PDF path detection. Existing Ctrl+V paste behavior is unchanged, so users can still paste images and attachments normally.

This fixes the path-as-text case because pasted file paths no longer have to go through pasteInputText(), which can convert valid image/PDF paths into attachments before the model sees the literal path.

How did you verify your code works?

• bun test test/config.test.tsx test/clipboard.test.ts from packages/tui
• bun test from packages/tui
• bunx oxlint packages/tui/src/clipboard.ts packages/tui/src/context/clipboard.tsx packages/tui/src/config/keybind.ts packages/tui/src/component/prompt/index.tsx packages/tui/test/config.test.tsx reports 0 errors

bun typecheck with Bun 1.3.14 currently fails in @opencode-ai/tui at src/context/data.tsx; I verified the same failure exists on clean dev, so this PR leaves that unrelated issue untouched.

Screenshots / recordings

No screenshot. This is a TUI keybinding/input behavior change.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍

[zxkjack123]

Great PR — this is exactly the fix I've been looking for.

I independently diagnosed the same root cause: when pasting a file path from the system clipboard into OpenCode's TUI, the pasteInputText() handler auto-detects it as a local file and converts it to an attachment reference instead of inserting the literal path text. The text/plain clipboard content is correct (verified via xclip), so the issue is entirely in how OpenCode processes the pasted content.

Adding Ctrl+Alt+V as a plain-text paste bypass is a clean solution — it preserves the existing image/attachment paste behavior on Ctrl+V while giving users an explicit escape hatch for when they need the path as text.

Tested scenario this fixes: "copy a file path from VS Code Explorer → paste into OpenCode → path gets replaced with a file reference like PDF 1 instead of the actual full path".

Looking forward to seeing this merged!

[github-actions]

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