Implements issue #31: About dialog with version/build/build date from getAppInfo, global help overlay toggle that does not reflow layout, and AboutHelpUITests.
Implements issue #31: About dialog with version/build/build date from `getAppInfo`, global help overlay toggle that does not reflow layout, and `AboutHelpUITests`.
- Branch: `feat/31-about-help-chrome` → `milestone/m6-gamut-stage0-cgats-release`
- resolves issue #31
- Labels: `Project/ICCery-v2`, `Feature/UI`, `Priority/Medium`
- Add ArtefactFiles.appInfo() build date from executable mtime.
- Add AboutView with version, build, build date, and close button.
- Add HelpOverlay view modifier for non-reflowing help badges.
- Wire About as a sheet and help toggle in SidebarView/RootView.
- Add AboutHelpUITests coverage.
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Implements issue #31: About dialog with version/build/build date from
getAppInfo, global help overlay toggle that does not reflow layout, andAboutHelpUITests.feat/31-about-help-chrome→milestone/m6-gamut-stage0-cgats-releaseProject/ICCery-v2,Feature/UI,Priority/Medium