FN-6815: add Shadcn Gray Blue theme
Add a slate-neutral Shadcn Gray Blue dashboard theme variant.\n\n- Register shadcn-gray-blue across core theme validation, startup bootstrap, and selector options.\n- Add dark and light slate blue-gray design tokens, swatches, and shared shadcn styling coverage.\n- Extend theme tests, dashboard docs, and the published package changeset for the new variant.\n\nFiles changed:\n .changeset/shadcn-gray-blue-theme.md | 5 +\n docs/dashboard-guide.md | 2 +-\n packages/core/src/types.ts | 2 +\n .../dashboard/app/components/ThemeSelector.css | 15 +++\n .../components/WorkflowOptionalStepsDropdown.css | 3 +-\n packages/dashboard/app/components/themeOptions.ts | 2 +\n .../dashboard/app/hooks/__tests__/useTheme.test.ts | 12 ++\n packages/dashboard/app/index.html | 2 +-\n packages/dashboard/app/public/theme-data.css | 143 ++++++++++++++++++++-\n 9 files changed, 177 insertions(+), 9 deletions(-)
Fusion-Task-Id: FN-6815
Fusion-Task-Lineage: 71cca9b3-12ab-4b91-93c5-e3d2498501ce
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