chore: set up Knip

[antfubot]

Description

Adds Knip to find unused files, dependencies and exports across the workspace.

• Adds knip to the devtools catalog and a root knip script (pnpm knip).
• Adds knip.jsonc, tuned for this repo's monorepo structure:
  • Per-workspace entry overrides only where they're not already covered by package.json#exports/bin (which Knip resolves back to source via sourcemaps) — e.g. the standalone client dev app in packages/core, webext's flat src/*.ts build, and the examples' playground/ dev apps.
  • nuxt/unocss config path overrides for packages/{oxc,rolldown,vite}, whose Nuxt apps live nested under src/ (srcDir: 'app') rather than at the workspace root.
  • ignoreFiles for fixtures/snapshots, plus the packages/{oxc,rolldown,vite}/src/app/** Nuxt app trees — Knip's Nuxt plugin registers its component/composable auto-import compilers relative to the workspace root rather than the resolved nuxt.config location, so anything consumed only via Nuxt's auto-import (template tags, unimport) in these nested apps can't be traced back to source and is misreported as unused. src/node/**, src/modules/** and src/shared/** are unaffected.
• Fixes the handful of dependency-hygiene issues Knip's plugin detection surfaced along the way:
  • packages/rolldown and packages/vite invoke the nuxi CLI in their own build scripts without declaring nuxt.
  • packages/core's standalone client imports unocss/vite without declaring unocss.
  • packages/ui uses @floating-ui/dom without declaring it — added as a peerDependency, matching its other UI peer deps.
• Wires a Knip step into CI (non-blocking via continue-on-error, since the repo has pre-existing findings — see below).

With this config, Knip reports a clean, structural baseline plus a small set of real, pre-existing findings left for a follow-up cleanup pass rather than folded into this setup PR: 2 dead files, 70 unused devDependencies, 82 unlisted dependencies, 53 unused exports, 44 unused exported types, 1 duplicate export, 1 unresolved import, 2 unlisted binaries, and 6 unused catalog entries.

Linked Issues

Additional context

Run pnpm knip to see the current findings. Once they're triaged (fixed or added to ignore*/ignoreFiles), the CI step's continue-on-error: true can be dropped to make it blocking.

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This PR was created with the help of an agent.

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commit: e50cdb9