fix: regenerate lockfile and update workspace references

[nikosxenakis]

Summary

• Update 6 example test package.json files to reference pic-js-mops instead of @dfinity/pic
• Update 19 example TypeScript files to import from pic-js-mops instead of @dfinity/pic
• Regenerate pnpm-lock.yaml and bun.lockb lockfiles
• Restore postinstall script in packages/pic/package.json (downloads PocketIC binary)
• Fix prettier formatting in source files
• Fix Jest module resolution for .js → .ts imports in test setup
• Replace ArrayBufferLike with concrete types (Uint8Array, ArrayBuffer) to fix TS build under newer type definitions
• Pin @types/node and typescript to exact versions to ensure bun resolves the same types as pnpm

Context

The package was renamed from @dfinity/pic to pic-js-mops and peer dependencies changed from @dfinity/* to @icp-sdk/core, but lockfiles, workspace references, example imports, and test config were not updated. Additionally, the postinstall script for downloading the PocketIC binary was missing from packages/pic/package.json, and ArrayBufferLike types became incompatible with newer TypeScript / @types/node versions used by bun.

Changes

1. Workspace references — all 6 example package.json and 19 example .ts files updated from @dfinity/pic to pic-js-mops
2. Lockfiles — pnpm-lock.yaml and bun.lockb regenerated
3. PocketIC binary — restored "postinstall": "node ./postinstall.mjs" in packages/pic/package.json
4. Prettier — formatted pocket-ic-server-types.ts, pocket-ic-server.ts, util/candid.ts
5. Jest config — added moduleNameMapper and Module._resolveFilename shim for .js → .ts resolution
6. TypeScript types — replaced ArrayBufferLike with Uint8Array | ArrayBuffer in pocket-ic.ts, pocket-ic-types.ts, and candid.ts
7. Pinned devDeps — @types/node pinned to 22.13.10, typescript to 5.8.2 (removed ^ ranges)

Note: Peer dependency version mismatches exist between root devDeps (@dfinity/*@2.3.0) and @icp-sdk/core@4.2.3 (expects 3.4.3). This is a pre-existing issue not addressed here.