chore(web): upgrade frontend to TypeScript 6

[lc6464]

Summary

This PR picks and adapts the TypeScript 6 upgrade from sipeed/NanoKVM-Pro#138 for NanoKVM.

It upgrades the web frontend from TypeScript 5.9.3 to the latest TypeScript 6 release, 6.0.3, and migrates the project configuration away from the deprecated baseUrl option. NanoKVM already uses Vite 8's native resolve.tsconfigPaths support from #853, so the NanoKVM-Pro PR's Vite alias replacement is not needed here.

Changes

• Upgraded TypeScript from 5.9.3 to 6.0.3 and updated the pnpm lockfile.
• Removed baseUrl with @andrewbranch/ts5to6 --fixBaseUrl; the tool confirmed that no project relies on baseUrl for module resolution and preserved the existing @/* -> ./src/* mapping.
• Explicitly set the Vite configuration TypeScript target to ES2023, preserving the intended modern Node.js runtime target instead of adopting TypeScript 6's newer implicit default.
• Kept Vite 8's native tsconfig path resolution unchanged.
• No application source, backend, API, or runtime behavior changes.

Verification

• pnpm install --frozen-lockfile with pnpm 11.20.0, including the repository's supply-chain policy check.
• pnpm exec tsc --noEmit --stableTypeOrdering.
• pnpm build with Vite 8.2.0 (5,339 modules transformed).
• pnpm lint (0 errors; 15 pre-existing React Hook warnings remain).
• Mocked login-page smoke test with playwright-cli: one application root, two inputs, and one button rendered.
• git diff --check.

[Copilot]

Pull request overview

This PR upgrades the web/ frontend toolchain to TypeScript 6.0.3, adjusts TypeScript project configuration to remove the deprecated baseUrl setting while keeping the existing @/* -> ./src/* path mapping, and pins the Vite config TS build target for the Node-side config file.

Changes:

• Bump typescript from ^5.9.3 to ^6.0.3 and update pnpm-lock.yaml accordingly.
• Remove compilerOptions.baseUrl from web/tsconfig.json while retaining compilerOptions.paths.
• Set compilerOptions.target to ES2023 in web/tsconfig.node.json (for vite.config.ts).

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
web/tsconfig.node.json	Sets TS target to ES2023 for the Node/Vite config compilation context.
web/tsconfig.json	Removes deprecated baseUrl while keeping the @/* path mapping.
web/pnpm-lock.yaml	Updates lockfile to reflect TypeScript 6.0.3 (and peer wiring).
web/package.json	Updates the TypeScript devDependency to ^6.0.3.

Files not reviewed (1)

• web/pnpm-lock.yaml: Generated file

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.