linux: close tab variants and 5 more action handlers

[Jesssullivan]

Summary

• Expand CLOSE_TAB to support all three ghostty close modes:
  • THIS — close current tab (existing behavior)
  • OTHER — close all tabs except current
  • RIGHT — close all tabs to the right of current
• Add TOGGLE_TAB_OVERVIEW stub (returns false until AdwTabOverview widget is added)
• Add TOGGLE_WINDOW_DECORATIONS — toggle CSD via gtk_window_set_decorated
• Add MOUSE_OVER_LINK — set pointer cursor when hovering clickable links
• Add PROGRESS_REPORT — store shell integration progress (OSC 9;4) on Panel
• Add SCROLLBAR — accept scrollbar state (rendering deferred)
• Add progress_state/progress_value fields to Panel struct

Action coverage: 34 of ~45 ghostty runtime actions.

Test plan

• CI passes on all distros
• Nix flake check passes

[greptile-apps]

Greptile Summary

This PR expands the CLOSE_TAB handler to cover all three ghostty close modes (THIS/OTHER/RIGHT) and adds five new action handlers: TOGGLE_WINDOW_DECORATIONS, MOUSE_OVER_LINK, PROGRESS_REPORT, SCROLLBAR (no-op), and TOGGLE_TAB_OVERVIEW (stub). The Panel struct gains progress_state/progress_value fields, and previous review concerns (sentinel type, SCROLLBAR return value, Wayland log warning) have all been addressed.

Confidence Score: 5/5

Safe to merge; only a single P2 defensive-programming suggestion remains.

All prior P1 findings from the thread are resolved. The one new finding (unclamped @intcast in handleProgressReport) is P2 — it only triggers if libghostty delivers an out-of-spec value > 255 for an OSC 9;4 field defined as 0–100, which is not expected in practice.

No files require special attention.

Important Files Changed

Filename	Overview
cmux-linux/src/app.zig	Adds handleCloseTab with all three close modes, handleToggleTabOverview/WindowDecorations stubs, handleMouseOverLink cursor update, handleProgressReport, and handleScrollbar no-op. Logic is correct; minor P2 unclamped intCast in handleProgressReport.
cmux-linux/src/workspace.zig	Adds progress_state and progress_value (?u8 = null) fields to Panel struct. The previous i8 sentinel concern has been resolved with an idiomatic optional type.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[onAction callback] --> B{action.tag}
    B --> C[CLOSE_TAB]
    B --> D[TOGGLE_TAB_OVERVIEW\nstub → false]
    B --> E[TOGGLE_WINDOW_DECORATIONS\ngtk_window_set_decorated]
    B --> F[MOUSE_OVER_LINK\nset pointer cursor]
    B --> G[PROGRESS_REPORT\nstore on Panel]
    B --> H[SCROLLBAR\nno-op → false]

    C --> C1{close mode}
    C1 -->|THIS| C2[closeWorkspace current]
    C1 -->|OTHER| C3[close all ≠ current\nreverse iterate]
    C1 -->|RIGHT| C4[close current+1 to end\nreverse iterate]

    G --> G1[find Panel by widget]
    G1 --> G2[panel.progress_state = report.state]
    G2 --> G3[panel.progress_value = clamp 0-100]

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_{Reviews (2): Last reviewed commit: "fix: address Greptile P2 findings on PR ..." | Re-trigger Greptile}