chore(js-ts): Convert Confetti to TypeScript

[devin-ai-integration]

Summary

Part of Workstream 2 (Base & UI component JS→TS migration). Converts the Confetti UI component from JS to TS. Type-only changes — snapshot identical.

• app/components/UI/Confetti/index.js → .tsx
• app/declarations/index.d.ts: adds declare module 'react-native-confetti'; (the lib ships no types; per project policy we declare the module rather than installing @types).

Worth knowing (rest is mechanical):

• Props are typed Partial<ExplosionProps> (imported from react-native-confetti-cannon, which ships its own types). The only caller renders <Confetti /> with no props; the explicit count/origin/fadeOut on ConfettiCannon remain, with {...props} spread after.

• The mutable ref holder is typed to expose the method used on Android:

  let confettiView: { startConfetti: () => void } | false = false;

  No any introduced.

Validation (local)

• yarn lint:tsc: passes, 0 errors.
• eslint on the file: passes (0 errors; one non-blocking import/no-named-as-default-member warning that originates from ESLint failing to parse the third-party react-native-confetti-cannon JS source — unrelated to this diff).
• yarn jest (Confetti): 1 suite / 1 test pass, snapshot identical.

CI note

The install-gated CI jobs on this fork fail before reaching any TS/test step due to a preexisting broken dependency (react-native-tcp pins a GitHub commit that now 404s on yarn install); check-diff/CLABot/label checks also fail on all fork PRs for preexisting infra/governance reasons (ruby/setup-ruby detects the macOS runner as self-hosted). None are caused by this diff, which contains only a file rename, a module declaration, and type annotations — no lockfile change.

Link to Devin session: https://app.devin.ai/sessions/a0f7f796d1fb45e88b2feabe5829a4ac
Requested by: @WesternConcrete

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