UI cleanup: rework per-session action icons and reduce overall button clutter

[mortenaslo]

Problem

The small action/icon buttons next to each shell window (sleep, close, etc.) currently make the UI/UX confusing. They enable convenient one-click actions, but their placement and density work against clarity:

• Icons appear in multiple places (sidebar entry, terminal toolbar) with overlapping responsibilities
• It's not always clear which icon affects which session, especially in grid layouts
• There are simply a lot of buttons across the app — even the Settings window has grown too large

Highest priority: per-session action icons

These are the biggest source of confusion and should be fixed first.

Proposed direction (open to discussion):

• Action icons should most likely always live in the top-right of the terminal pane, consistently
• They don't necessarily need to appear in the sidebar / shell overview at all — or this could be controlled by a setting
• Consider: hover-to-reveal vs. always-visible, and whether secondary actions belong in an overflow ⋯ menu

Options to consider:

1. Icons only in terminal pane top-right (clean overview, one canonical location)
2. Icons in both places, but minimized in the sidebar (e.g. only ✕ visible, others in overflow)
3. User setting: "Show action icons in sidebar" on/off

Secondary: general button/UI cleanup

• Audit the main toolbar — which buttons are actually used regularly?
• Settings window has gotten too large; consider grouping into tabs or sections, or hiding advanced options behind a "Show advanced" toggle
• Look for redundant entry points to the same action

Acceptance

• Per-session action icons have a single, consistent location (likely top-right of the terminal pane)
• Sidebar entries are visually calmer — either no inline actions or a much reduced set
• Optional setting governs sidebar action visibility if we keep them there
• Settings window is reorganized so it no longer feels overwhelming
• Overall button count across main UI is reduced or grouped

[AThraen]

Partially shipped via #34 (merged 2026-05-12)

The highest-priority piece — per-session action icons in the sidebar — is done.

Shipped

• Sidebar row icons reduced from 6 (📁 >_ ➕ ✏ 💤 ✕) to 3 (➕ 💤 ✕).
• New SidebarActionIconsMode setting (Appearance → "Sidebar action icons"): On hover (default) / Always show / Hide (use right-click instead). OnHover keeps the panel laid out (no text reflow when hovering in/out) but transparent + non-interactive until the row is hovered. Hidden collapses the panel and reclaims the horizontal space for the session text.
• Terminal toolbar now has its own ✕ close at the far right, so it is a complete canonical home for per-session actions — matches option 1 in the issue.
• Open in Explorer / Open PowerShell here / Rename moved to the right-click context menu so nothing is lost. Rename uses the same in-place editor as double-click.
• Live setting propagation: changing the mode applies to every existing row on Save, no rebuild.

Acceptance check

• Per-session action icons have a single, consistent location (terminal toolbar top-right; sidebar buttons are now opt-in via the mode)
• Sidebar entries are visually calmer
• Optional setting governs sidebar action visibility
• Settings window is reorganized so it no longer feels overwhelming
• Overall button count across main UI is reduced or grouped (the sidebar is, but the main toolbar audit and settings reorg are still pending)

Deferred — leaving this issue open

• Settings window reorg (tabs / advanced toggle / grouping). 430-line XAML, large enough to deserve its own PR.
• Main app toolbar audit — which buttons are actually used regularly?

Happy to split the remaining work into separate issues if that's easier to triage.

[AThraen]

Partial progress in v0.5.0:

• Sidebar action icons now hover-to-reveal (with always-visible terminal toolbar ✕)
• New SidebarActionIconsMode setting: OnHover (default) / Always / Hidden

Still open from the acceptance list:

• Settings window reorg (still feels overwhelming)
• Broader toolbar/button audit