DS extraction: recurring UI pattern (ds-fp:0444d418a6e7)

[github-actions]

@claude — gate-ds-conformance detected a UI pattern duplicated across the codebase that should be extracted into a design-system primitive (CLAUDE.baseline.md §6).

Stable marker: ds-fp:0444d418a6e7 (do not edit — used for idempotent de-duplication)

Where it recurs

• frontend/src/components/InstallAppDialog.tsx:323
• frontend/src/components/NotificationBell.tsx:297
• frontend/src/components/UserMenu.tsx:421
• frontend/src/pages/ApplicationsPage.tsx:173

Sample

className="btn btn-ghost"

Proposed component spec (refine before building)

• Name: <PascalCaseComponent> (in the repo design-system package — frontend-engineer is the sole owner of design-system/)
• Props: derive from the variation across the call sites above.
• Variants: the distinct visual variations seen at the locations.
• States: default / hover / focus / active / disabled / loading as applicable.
• Tokens: must consume DS tokens only (color/spacing/type/radius) — zero raw values.

Acceptance criteria

• Component added to the design-system package (not one-off in feature code), tokens-only.
• All listed call sites refactored to use it.
• a11y + RTL covered; unit test in the DS package.
• gate-ds-conformance stays green after refactor.

Filed automatically; owner is frontend-engineer. Extraction is design work, not done by this gate.