ref(types): narrow type in Promise.catch from any to unknown

[TkDodo]

Adds a global type declaration that overrides Promise.catch and .then rejection callbacks to receive unknown instead of any. This forces explicit type narrowing at every catch site, preventing silent property access on untyped error objects.

Type Declaration

A new static/app/types/promise.d.ts re-declares the Promise interface so that onrejected receives unknown. This is the same approach TypeScript uses for catch(e) in try/catch blocks since useUnknownInCatchVariables, but applied to Promise chains which TypeScript doesn't cover natively.

Call Site Fixes

Each .catch / .then(_, onrejected) handler is updated to narrow the error before accessing properties — typically via instanceof RequestError, explicit (err: Error) annotations, or (err: any) where the handler's shape is too dynamic to narrow cleanly right now.

[TkDodo]

bugbot run

[github-actions]

📊 Type Coverage Diff

Metric	Before	After	Delta
Coverage	93.40%	93.44%	🟢 +0.04%
Typed	134,863	134,935	🟢 +72
Untyped	9,533	9,473	🟢 -60

🔍 6 new type safety issues introduced

Type assertions (as) (6 new)

File	Line	Detail
static/app/actionCreators/projects.tsx	146	as string — err.responseJSON.detail as string
static/app/components/selectMembers/index.tsx	144	as Error — err as Error
static/app/views/performance/transactionSummary/transactionThresholdButton.tsx	87	as string — errorMessage as string
static/app/views/performance/transactionSummary/transactionThresholdModal.tsx	101	as string — errorMessage as string
static/app/views/performance/transactionSummary/transactionThresholdModal.tsx	147	as string — errorMessage as string
static/app/views/settings/project/projectOwnership/ownerInput.tsx	92	as InputError — caught.responseJSON as InputError

This is informational only and does not block the PR.

[JoshuaKGoldberg]

[cursor]

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