feat(ui): add pager sidebar toggle

[clabby]

Overview

Adds the ability to toggle the sidebar in pager mode. This makes navigating larger diffs a bit easier when using hunk as the pager for jj or git.

[greptile-apps]

Greptile Summary

This PR extends pager mode with a toggleable sidebar file tree, allowing users to press s to reveal or hide the file list while keeping the normal pager chrome (menu bar) hidden. The implementation is clean: sidebarVisible is initialized to !pagerMode so the sidebar starts hidden in pager mode, and the hard pagerMode ? false : … guard in renderSidebar is replaced by letting sidebarVisible own the behavior directly.

• App.tsx: pagerMode is hoisted before the state declarations so the lazy useState(() => !pagerMode) initializer can reference it; renderSidebar is simplified by removing the unconditional false branch for pager mode.
• useAppKeyboardShortcuts.ts: Adds an s handler to handlePagerShortcut calling toggleSidebar; also adds a missing return after toggleLineWrap that would have caused unnecessary fall-through evaluation.
• Both unit (AppHost.interactions.test.tsx) and PTY integration (ui-integration.test.ts) tests cover the toggle-on / toggle-off cycle and confirm the menu bar stays hidden.

Confidence Score: 5/5

Safe to merge; the change is well-scoped and both unit and PTY integration tests cover the new toggle behaviour.

The refactor is minimal and mechanically correct: moving pagerMode before the state declarations, initialising sidebarVisible with !pagerMode, and wiring up the s handler in handlePagerShortcut all work together cleanly. No existing behaviour is broken for non-pager mode.

No files require special attention.

Important Files Changed

Filename	Overview
src/ui/App.tsx	Moves pagerMode computation before state declarations and simplifies renderSidebar logic by letting sidebarVisible (initialized to !pagerMode) own the hiding behavior instead of a hard pagerMode ternary.
src/ui/hooks/useAppKeyboardShortcuts.ts	Adds s key handler to handlePagerShortcut to call toggleSidebar; also fixes a latent fall-through by adding a missing return after toggleLineWrap in the pager shortcut handler.
src/ui/AppHost.interactions.test.tsx	Adds a new interaction test verifying the sidebar can be toggled on and off in pager mode using the s shortcut, and that the menu bar remains hidden throughout.
test/pty/ui-integration.test.ts	Adds a PTY-level integration test confirming sidebar appears with expected file-tree row format after pressing s in pager mode, with no menu bar visible.
CHANGELOG.md	Documents the new pager-mode sidebar toggle under the Added section for the upcoming release.

Sequence Diagram

sequenceDiagram
    participant User
    participant useAppKeyboardShortcuts
    participant App as App.tsx (state)
    participant Renderer

    Note over App: pagerMode=true, sidebarVisible=false (initial)
    App->>Renderer: "renderSidebar = false"

    User->>useAppKeyboardShortcuts: press s
    useAppKeyboardShortcuts->>App: toggleSidebar()
    App->>App: setSidebarVisible(true)
    App->>Renderer: "renderSidebar = true"

    User->>useAppKeyboardShortcuts: press s again
    useAppKeyboardShortcuts->>App: toggleSidebar()
    App->>App: setSidebarVisible(false)
    App->>Renderer: "renderSidebar = false"

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