emrg: keep result-panel toggle visible when collapsed (rant 2026-08-10T14:11:18)

[argszero]

Fix GUI result-panel deadlock: after collapsing via the toggle button, the header (including the toggle button) was hidden with the panel, so it could not be re-expanded except via ⌘\\ / Ctrl+\\ shortcut.

Root cause

renderer/css/layout.css collapsed rules set width: 0 and display: none on both .result-header (which contains the toggle button) and .result-list — the button became invisible/unclickable.

Fix (方案 A: keep a visible grip)

• Collapsed panel shrinks to a 40px narrow strip (not 0) with a left border
• Only .result-list (content area) is hidden
• .result-header stays display: flex, centered, showing only the toggle button (title hidden)
• Toggle button rotates 180° (» → «) to indicate expandability
• Collapsed-state persistence (localStorage) and narrow-screen auto-hide logic unchanged

Tests

• New GUI test: '折叠后 toggle 按钮仍可见可点' — CSS source assertions (40px width not 0, header display:flex, list hidden, toggle rotate) + DOM survival check after toggle
• GUI suite: 110 → 111 (renderer smoke 31 → 32), all green
• Python: 674 pytest passed; doc-count guard (README/Agent/README.cn) synced to 111

Acceptance (rant)

• Collapsed → narrow strip with visible toggle button ✅
• Button click re-expands (bidirectional toggle) ✅
• ⌘\\ / Ctrl+\\ still works ✅
• Transition animation intact (0.2s) ✅
• Narrow-screen auto-hide unaffected ✅
• GUI tests green + new collapsed-state visibility test ✅

[argszero]

✅ LGTM — cycle 20260810-141050. 674 pytest + 111 GUI tests passed locally (renderer smoke +1), import + CLI smoke OK. CSS fix matches rant 方案 A: 40px strip, header visible, list hidden, toggle rotated; doc counts synced.

[argszero]

✅ LGTM — cycle 20260810-142102. Test workflow 31361524641 SUCCESS (1m18s). Verified CSS change (40px strip, header flex, list hidden, toggle rotate) + new GUI test passes locally; doc counts 111 synced.

[argszero]

✅ LGTM — cycle 20260810-142042. Verified on feature/result-panel-collapsed-toggle: full GUI suite 111/111 pass (renderer smoke +1 regression test: collapsed = 40px strip, header/toggle visible, list hidden, toggle rotate(180deg); DOM survival check). Doc counts synced (29+22+32+15+7+3+3=111). CSS matches rant 2026-08-10T14:11:18 plan A — collapse deadlock resolved.