fix(opencode): image paste on Windows Terminal 1.25+ with kitty keyboard

[Hona]

Summary

• Enable kitty keyboard events: true so Windows Terminal 1.25+ reports key release events
• Detect Ctrl+V key release on Windows to trigger clipboard image probe (WT 1.25+ swallows the press but leaks the release)
• Add comments documenting the three Windows paste trigger paths

Depends on anomalyco/opentui#819 (stdin parser fix for split escape sequences across reads) for stability, without the opentui change, only about half of ctrl+v events are detected.

Context

Windows Terminal 1.25+ with kitty keyboard support does not send an empty bracketed paste for image-only clipboard (stable WT does). The only signal we get is the Ctrl+V key release event (CSI 118;modifier;3u), which requires events: true in the kitty keyboard config.

[Copilot]

Pull request overview

Updates the TUI paste handling to support image paste on Windows Terminal Preview when kitty keyboard mode is enabled, by enabling key release events and using Ctrl+V release as the signal to probe the clipboard for image data.

Changes:

• Enable kitty keyboard events: true in the TUI renderer config.
• Add a Windows-only Ctrl+V release keyboard handler in the prompt to trigger an image clipboard probe/paste.
• Clarify clipboard/paste-path behavior with additional inline comments.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
packages/opencode/src/cli/cmd/tui/util/clipboard.ts	Adds documentation about Windows-specific paste trigger paths and clarifies why direct clipboard probing is needed for images.
packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx	Adds Ctrl+V release detection on Windows to paste clipboard images; updates comments around paste behavior.
packages/opencode/src/cli/cmd/tui/app.tsx	Enables kitty keyboard events globally so key release events can be observed (needed for WT Preview behavior).

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[Hona]

vouch @Hona