One-click context compaction button

[ohsalmeron]

The session context usage indicator already shows how full the context window is, but there's no way to trigger compaction from the UI without using the command palette (/compact).

Adding a small compact icon button next to the context usage progress circle lets users one-click compact. It calls the existing POST /api/session/:sessionID/compact endpoint and needs no new API work.

I have a working branch with the change: ohsalmeron/opencode:context-compact

[github-actions]

This issue does not fully meet our contributing guidelines.

What needs to be fixed:

• Feature requests must use the [FEATURE]: prefix in the title (e.g., [FEATURE]: One-click context compaction button).
• The Feature Request template requires a verification checkbox confirming the feature has not been suggested before, and a description of the problem or need — neither is present here.

Please edit this issue to address the above within 2 hours, or it will be automatically closed.

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This issue might be a duplicate of existing issues. Please check:

• [FEATURE]: Manual Session Compact #35470: Manual Session Compact — requests a user-triggered compact action, same core ask.
• [FEATURE]: Surface compaction progress and live context usage in the TUI #32926: Surface compaction progress and live context usage in the TUI — overlapping UI/UX request for surfacing compaction controls in the interface.

If you believe this was flagged incorrectly, please let a maintainer know.

[github-actions]

This issue has been automatically closed because it was not updated to meet our contributing guidelines within the 2-hour window.

Feel free to open a new issue that follows our issue templates.