Add testing skill for workspace IDE layout system

.agents/skills/testing-workspace-ide/SKILL.md

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+# Testing Workspace IDE — Layout System
+
+## Overview
+The workspace IDE has a kitty terminal emulator-inspired layout system with 7 layout modes: Stack, Tall, Fat, Grid, Splits, Horizontal, Vertical. These are selectable via a LayoutSelector dropdown in the TopBar and cyclable via Ctrl+Shift+L.
+
+## Dev Server Setup
+1. `cd` to the repo root
+2. Run `npm install` then `npm run dev`
+3. App runs at `http://localhost:5174` (Vite dev server)
+4. Default state: Splits layout with 3 panes (Editor, Preview, Console)
+
+## Key UI Elements
+- **LayoutSelector**: TopBar button near top-right showing current layout name + dropdown arrow. Click to open dropdown with all 7 layout options.
+- **Layout Options panel**: When Tall or Fat is selected, the dropdown shows extra controls: Bias slider (10-90%), Full-size panes slider (1-5), Mirrored checkbox.
+- **Stack mode tab bar**: When Stack layout is active, a pane tab bar appears at the top of the workspace area with tabs for each pane.
+- **Keyboard shortcut**: Ctrl+Shift+L cycles through enabled layouts sequentially.
+
+## Testing Procedures
+
+### Layout Switching
+- Click LayoutSelector dropdown → select each layout → verify:
+  - TopBar label updates to match selected layout name
+  - Pane arrangement visually changes (each layout should look different)
+- All 7 layouts should produce distinct visual arrangements with 3 panes
+
+### Stack Mode Tab Switching
+- Switch to Stack layout → verify only one pane visible at a time
+- Click each tab in the pane tab bar → verify content changes (Editor shows code, Preview shows "App not running", Console shows placeholder text)
+
+### Config Controls (Tall/Fat)
+- Switch to Tall layout → open dropdown to see Layout Options
+- Adjust Bias slider → verify main pane width changes visually
+- Toggle Mirrored checkbox → verify layout flips left/right (Tall) or top/bottom (Fat)
+- **Tip**: Range input sliders may be hard to drag precisely via computer-use tools. Use JavaScript via browser console to set slider values:
+  ```js
+  const slider = document.querySelector('input[type="range"]');
+  const setter = Object.getOwnPropertyDescriptor(window.HTMLInputElement.prototype, 'value').set;
+  setter.call(slider, 75);
+  slider.dispatchEvent(new Event('input', { bubbles: true }));
+  slider.dispatchEvent(new Event('change', { bubbles: true }));
+  ```
+
+### Keyboard Shortcut
+- Press Ctrl+Shift+L multiple times → verify TopBar label changes to next layout in cycle order
+- Layout order: stack → tall → fat → grid → splits → horizontal → vertical (then wraps)
+
+## Tips & Known Issues
+- The LayoutSelector dropdown closes when clicking a different layout. To see Layout Options for Tall/Fat, you may need to click the dropdown button again after switching.
+- Stack mode is the most visually distinct — only one pane visible with tab bar. Good baseline for verifying layout switching works.
+- Bias and Mirrored controls only appear for Tall and Fat layouts.
+- The app uses Zustand for state management. Layout state is in `workspaceStore` under `kittyLayout`.
+- CI runs build check and Devin Review. No automated test suite exists — testing is manual/E2E via browser.
+
+## Devin Secrets Needed
+None — the app runs locally with no authentication required.