feat: per-session run commands + sidebar action-icon cleanup

[AThraen]

Summary

Two related additions to the per-session UI:

• Per-session run commands (issue Add play button to run the session's main project #33). Each session keeps a list of labelled commands (Test / Build / Watch / Run …). A toolbar ▶ runs the default; the ▼ chevron exposes the rest; F5 / Shift+F5 run/stop the default. Runs execute in a separate headless PseudoTerminal wrapped in a Windows Job Object so the whole child tree dies when the session sleeps or closes — a Claude session is untouched. Output streams into a chips-and-drawer UI; the drawer offers Stop, Copy, and Send to terminal (which wraps in a fenced preamble for Claude parents and falls back to clipboard for non-Claude shells). New sessions are seeded from RunCommandTemplatesService based on top-level project detection (dotnet → cargo → node → python → make). Editor dialog reachable from ▶ right-click, the ▼ dropdown's "Edit commands…", and the sidebar right-click "Session commands ▸" submenu.

• Sidebar action-icon cleanup (partially addresses issue UI cleanup: rework per-session action icons and reduce overall button clutter #29). The sidebar row button stack drops from 6 (📁 >_ ➕ ✏ 💤 ✕) to 3 (➕ 💤 ✕), governed by a new SidebarActionIconsMode setting: OnHover (default) / Always / Hidden. OnHover keeps the panel laid out — no text reflow when hovering — but transparent and non-interactive until the row is hovered. Open in Explorer / Open PowerShell here / Rename move to the right-click context menu so nothing is lost (rename uses the same in-place editor as double-click). The terminal toolbar gains its own ✕ close button so it's a complete canonical home for per-session actions.

Also redesigns the Run Commands editor dialog: the clipped "Default" column header is now a centered ★ glyph, columns get explicit widths with min-widths, row padding is more comfortable, and + Add command / Cancel / Save share one footer row.

Related issues

• Closes Add play button to run the session's main project #33 — Add play button to run the session's main project. Implementation diverges from the original proposal in two ways: runs go to a separate headless PTY instead of the active terminal (a Claude session shouldn't be polluted by dotnet run output), and a session carries a list of labelled commands rather than a single RunCommand: string?. Both were validated by issue comments and confirmed during implementation.
• Partially addresses UI cleanup: rework per-session action icons and reduce overall button clutter #29 — UI cleanup of per-session action icons. The icon-density problem on sidebar rows is fixed via reduction + hover-reveal + a configurable mode, and the terminal toolbar is now a self-sufficient action surface. Deferred to a separate change: reorganizing the Settings window into tabs / advanced toggle, and auditing the main toolbar.

Design notes

• Job Object lifetime. PseudoTerminal gained useJobObject: true plus JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE so child trees (npm test, dotnet watch, …) die with the wrapping PTY. RunInstance always opts in; the parent session PTY does not.
• Output capture. RunInstance strips ANSI and buffers up to 1 MB per run. Not persisted — runs are ephemeral and killed on session close / sleep / app exit.
• Single-default invariant. RunCommandItem.EnsureSingleDefault(list) is called on save and on seed; the dialog uses a RadioButton group so the invariant survives editing.
• Sleep teardown. SleepSession explicitly calls vm.Runner.StopAll() before the VM disposes so child processes die before the WebView2 / xterm controls start tearing down.
• Hover panel layout. OnHover mode flips Opacity + IsHitTestVisible but keeps Visibility=Visible so the row never reflows when the cursor enters or leaves. Hidden mode collapses the panel and reclaims the horizontal space for the text.
• Live setting propagation. A new _sidebarActionPanels dictionary lets SettingsButton_Click flip every row to the new mode immediately — no sidebar rebuild needed. _sidebarRenameActions captures the per-row in-place rename closure so the context menu Rename entry runs the same code path as a double-click.

Test plan

Recommend running with --clean for an isolated state:

dotnet run --project src/CodeShellManager/CodeShellManager.csproj -- --clean

Run commands (#33)

• Toolbar ▶ runs the default. Create a session in a .NET project. ▶ appears in the toolbar; clicking it spawns a headless run and a blue chip appears in the chips strip above the terminal. Chip turns green on success, pink on failure.
• Chevron ▼ dropdown. Configure 2+ commands via the editor; ▼ lists them with the default starred. Selecting a non-default runs it without changing the default.
• F5 / Shift+F5. F5 runs the default of the active session; Shift+F5 stops it. Doesn't fire when typing into the terminal (xterm captures it first via the existing accelerator surfacing).
• Drawer. Click a chip — drawer opens with output + ⏹ Stop / 📋 Copy / ↗ Send to terminal. Copy puts the captured output on the clipboard. Send-to-terminal on a Claude parent wraps the command in a fenced preamble and writes to the PTY (no auto-Enter); on a non-Claude shell it falls back to clipboard + toast.
• Project-type seed. Create a fresh session in a node project (top-level package.json); the new RunCommands list pre-populates with sensible templates (npm install / test / start, plus framework-aware extras). Same for dotnet / cargo / python / make. SSH sessions skip seeding.
• Editor dialog. Right-click ▶ → editor opens with rows for each command. Reorder via ▲ ▼, set default via the radio column, +Add / 🗑 work. Save persists across restart. The ★ header is centered and not clipped.
• Sidebar submenu. Right-click a session → Session commands ▸ lists each command with the default labelled (default); clicking runs it. Edit commands… opens the dialog.
• Cleanup on sleep / close / exit. Start a long-running command (ping -t 8.8.8.8); sleep the session — the chip clears, no orphan ping.exe survives in Task Manager. Same for close. Same for app exit while a run is in flight.

Sidebar action-icon cleanup (#29)

• OnHover default. Fresh install: sidebar rows show no inline action icons. Hovering a row fades in ➕ 💤 ✕ on the right (with no text reflow — the right column is reserved). Cursor leaves → icons fade back to invisible. Active and selected styling is unaffected.
• Always mode. Settings → Appearance → "Sidebar action icons" → "Always show". Icons persist regardless of hover.
• Hidden mode. Same dropdown → "Hide". Icons disappear; the session text expands into the reclaimed space. Right-click still exposes every action (Rename, Open in Explorer, Open PowerShell here, Duplicate session, New session here…, sleep, close, etc.).
• Live propagation. Change the mode in Settings → click Save → existing sidebar rows update immediately without needing a session re-create or app restart.
• Rename via right-click. Right-click any session → Rename session. The in-place editor opens on the row (same path as double-click); Enter saves, Escape cancels.
• Terminal toolbar ✕. A new ✕ at the far right of every terminal toolbar — clicking closes that session. Sits to the right of the existing ▶ ▼ 💤 📝 >_ 📁 cluster and the status dot.

Run Commands dialog redesign

• No clipping. Open the dialog with 2+ commands. The first column header is a centered ★ (not the truncated word "Default"). Tooltip on the star explains it's the default-row marker.
• Resize behavior. Drag the resize grip — columns honor their min-widths; the dialog clamps at the new MinWidth=560, MinHeight=360.
• Footer. + Add command (left) and Cancel / Save (right) share one row.

🤖 Generated with Claude Code