fix: six real bugs the old TypeScript config was hiding

[ludejun]

Note

React Native stays on 0.68. Moving to 0.87 crosses the New Architecture (Fabric / TurboModules) and means regenerating ios/ and android/ — work that needs Xcode and the Android SDK to verify, not something the JavaScript side can settle. This PR covers everything that can be done without them.

TypeScript 4.5 could not even parse the installed @types/node, and suppressImplicitAnyIndexErrors (removed in TS 5.5) was suppressing the rest. Upgrading to 5.9 and dropping that flag surfaced six genuine bugs — five of them runtime, not type-only.

The bugs

Per-device font sizing never ran	TextInput imported deviceType from the utils barrel, which only re-exports it under its alias isIOS. The import was undefined, so if (!deviceType) return 14 always took the first branch.
Two environments had no API domain	Env has eight members; apiServer defined six. local and bcp resolved to undefined, making the request base URL the literal string "undefined". Now typed Record<Env, string>, so a missing environment is a compile error.
The anti-double-submit Button never guarded anything	It declared a loading prop, tracked iLoading, and called setLoading(true) on press — but neither value was read anywhere in the component. Repeat presses went straight through. Presses during an in-flight onPress are now ignored.
Webview was not a valid navigation screen	It declared its own route shape, not assignable to React Navigation's ScreenComponentType. Now uses RouteProp with typed params. The || restProps fallback beside it was dead code — restProps only carries the connected props, never url / header / disableBottom.
The tab badge always read 0	TabScreen required homeTodoCount, but its connect() is commented out, so nothing supplied it.
The only test could never pass	__tests__/App-test.tsx imported '../App', while App.tsx lives in src/. On a case-insensitive filesystem that resolved to app.json, so React was handed an object.

Toolchain

• TypeScript 4.5 → 5.9, suppressImplicitAnyIndexErrors removed. 0 type errors.
• The test stack was internally inconsistent: jest 25 with babel-jest 28, @types/jest 27, and react-test-renderer 16 against React 18. Now jest 29 throughout.
• transformIgnorePatterns matches the React Native packages anywhere in the path — pnpm nests them under node_modules/.pnpm/… and the preset's own pattern assumes a flat node_modules.
• The whole-<App /> render test is replaced by 17 unit tests over the validation helpers (phone, bank card, ID card, URL, and the password rules). Rendering the full app needs every native module mocked and does not finish in CI.
• ESLint accepts _-prefixed unused bindings. 0 errors.
• Migrated to pnpm.

Docs

• English README_EN.md alongside the Chinese readme.md, both with badges and a plain statement of where React Native stands.
• New CHANGELOG.md and bilingual CONTRIBUTING.md.
• New ci.yml running lint, type-check and tests on Node 20 and 22 — deliberately not the app builds.

Verified

pnpm lint (0 errors), pnpm tslint (0 errors) and pnpm test (17 passing) all pass. The native builds were not run.

🤖 Generated with Claude Code