Document Theme V2 and engine theme ownership boundaries - PR_26152_057-theme-surface-boundary

Author: ToolboxAid

docs/dev/reports/tool_shell_flex_center_layout_validation.md

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+# PR_26152_056 Tool Shell Flex Center Layout Validation
+
+## Scope
+- Read docs/dev/PROJECT_INSTRUCTIONS.md before implementation.
+- Changed only the active reusable public tool-shell layout CSS used by the affected root public shell pages.
+- Affected behavior surface: the 11 root /tools/*.html pages that use .tool-workspace and tool-display-mode.js side-column collapse controls.
+- /tools/index.html was validated as the root Tools entry/link surface.
+- No tool HTML, JavaScript, data, images, partials, Admin, Account, Company, Games, Samples, or root index files were changed.
+- No page-local CSS, tool-local CSS, inline style/script/event handlers, or new component behavior were added.
+
+## Implementation
+- Updated GameFoundryStudio/assets/css/gamefoundrystudio.css .tool-workspace grid tracks.
+- Open side columns now use the same fixed approved width already used by focus mode: 280px.
+- Collapsed side columns use the existing fixed rail width: 56px.
+- Center column now uses minmax(0, 1fr) so it flexes to fill available horizontal space.
+- The existing focus-mode grid tracks were left unchanged.
+
+## Targeted Browser Validation
+Command: inline Node static server plus Playwright Chromium targeted to /tools/index.html and the affected root shell pages.
+Viewport: 1440 x 960.
+
+Validated pages:
+- /tools/ai-assistant.html
+- /tools/animation-studio.html
+- /tools/asset-studio.html
+- /tools/code-studio.html
+- /tools/input-studio.html
+- /tools/midi-studio.html
+- /tools/object-vector-studio.html
+- /tools/palette-manager.html
+- /tools/particle-studio.html
+- /tools/sound-studio.html
+- /tools/storage-inspector.html
+
+Measured result on every affected shell page:
+- Initial open layout: 280px / 584px / 280px.
+- Left collapsed: 56px / 808px / 280px.
+- Left reopened: 280px / 584px / 280px.
+- Right collapsed: 280px / 808px / 56px.
+- Right reopened: 280px / 584px / 280px.
+- Both collapsed: 56px / 1032px / 56px.
+- Final reopened: 280px / 584px / 280px.
+
+PASS - Left column stayed fixed at 280px when open.
+PASS - Right column stayed fixed at 280px when open.
+PASS - Collapsed left rail measured 56px.
+PASS - Collapsed right rail measured 56px.
+PASS - Left collapse expanded the center column from 584px to 808px.
+PASS - Right collapse expanded the center column from 584px to 808px.
+PASS - Both collapsed expanded the center column to the maximum measured width of 1032px.
+PASS - Reopening columns restored both side columns to 280px and did not resize them beyond the approved width.
+PASS - Center header remained h2 Workspace on every affected page.
+PASS - Center image, display-mode badge, and display-mode character image loaded on every affected page.
+PASS - Existing vertical accordions closed and reopened on every affected page.
+PASS - No browser console errors, request failures, 404s, or 403s were detected.
+PASS - /tools/index.html rendered, loaded 18 tile images, and contained links to all 11 affected root shell pages.
+
+## Static Validation
+PASS - git diff --check HEAD~1 HEAD -- GameFoundryStudio/assets/css/gamefoundrystudio.css.
+PASS - git diff --name-only HEAD~1 HEAD reported only GameFoundryStudio/assets/css/gamefoundrystudio.css.
+PASS - git diff --name-only HEAD~1 HEAD across tools, GameFoundryStudio/assets/js, GameFoundryStudio/assets/partials, GameFoundryStudio/assets/css/theme/v2, Admin, Account, Company, Games, Samples, and root index returned no files.
+PASS - No inline style/script/event handlers or imageDataUrl references were introduced.
+
+## Tests Intentionally Not Run
+- No repo-wide tests were run.
+- No tests outside affected root Tools/GameFoundryStudio paths were run.
+- No Admin, Account, Company, Games, Samples, root index, or first-class runtime tool pages were exercised beyond static scope checks.
+
+## Samples Decision
+- SKIP because this PR changes only the root public tool-shell layout behavior and does not affect samples.