fix(ui): remove blocksHolder DOM listeners and detach holder on destroy

[LocalhostTI]

Fixes #170

What

• BlocksUI now registers its blocksHolder DOM listeners (beforeinput, keydown) with an AbortController signal and aborts them in destroy(); the holder element itself is detached from the DOM as well.
• EditorjsUI.destroy() (previously a no-op) now removes the editor wrapper from the holder element.
• Adds the first test suite to @editorjs/ui (Blocks.spec.ts, index.spec.ts, 14 tests) with Jest + jsdom infra mirroring the core package setup. Written test-first (TDD): the destroy specs failed against the previous implementation.
• Adds a UI check CI workflow (ui.yml, unit tests without mutations, modeled on model-types.yml).

CI enablers (why this PR touches files outside packages/ui)

• .github/actions/base-coverage/action.yml: the guard now also skips base coverage when the base ref has no test:coverage script. Without this, the base-coverage step would run yarn workspace @editorjs/ui test:coverage against main (where the script doesn't exist yet) and fail. It flows through the same "missing base artifact" path that new packages already use (aggregate-report downloads artifacts with continue-on-error).
• packages/ui build script: build now runs build:deps (topological workspace-deps build) before vite build. Every other package builds via tsc --build whose project references transitively build workspace deps into their dist/; ui is the first vite-built package through the unit-tests action, and vite externalizes @editorjs/*, so on a fresh runner packages/sdk/dist would never exist and jest could not resolve @editorjs/sdk (reproduced locally by wiping dep dists). This makes ui's build behave like the tsc --build packages — matching the build action's "Build the package with dependencies" step.
• packages/ui/vite.config.ts: dts() now uses tsconfig.build.json (which excludes src/**/*.spec.ts); otherwise the new co-located specs leak empty *.spec.d.ts stubs into the published dist/.

Notes for reviewers

• The issue lists a third copy listener — that one is introduced by feat(core): implement Clipboard Plugin #129, which is not merged yet, so this PR covers the two listeners that exist on main. Once feat(core): implement Clipboard Plugin #129 lands, its copy listener can simply join the same AbortSignal.
• EventBus (non-DOM) subscriptions made in the BlocksUI/EditorjsUI constructors are intentionally untouched: the bus lives and dies with the editor instance. Happy to tackle that as a follow-up if you'd like.
• OpenSpec: openspec/specs/ui/spec.md gets destroy scenarios and a refreshed test-suite note (openspec validate ui passes). No openspec/changes/ proposal folder — small behavior bug fix with the spec delta applied directly, same approach as feat(core): implement Clipboard Plugin #129. Can convert to a full proposal if preferred.
• Expected CI caveat: this PR comes from a fork, so GITHUB_TOKEN is read-only and the Aggregate and post report job (which posts the coverage comment) will fail with 403. That's the repo-wide package-check.yml pattern, not something this PR changes — lint/tests/build jobs are unaffected. This will be the first fork PR to exercise the report job since it was introduced.

Verification

• packages/ui: yarn lint:ci (0 warnings), yarn test (14/14), yarn build — all green locally
• Fresh-runner simulation: after yarn workspaces foreach -A run clear (no dist/, no tsbuildinfo anywhere), the CI sequence yarn workspace @editorjs/ui run build && yarn workspace @editorjs/ui test:coverage passes
• yarn constraints and root yarn build pass; npx openspec validate ui passes

[Copilot]

Pull request overview

This PR fixes UI teardown leaks in @editorjs/ui by ensuring the blocks holder’s DOM listeners are removed and the holder/wrapper elements are detached during destroy(). It also introduces a Jest + jsdom test setup for the UI package and adds CI coverage for the package.

Changes:

• Add AbortController-scoped beforeinput/keydown listeners to BlocksUI and abort + detach the blocks holder in BlocksUI.destroy().
• Implement real teardown in EditorjsUI.destroy() by removing the editor wrapper from the holder.
• Introduce @editorjs/ui unit tests + Jest infrastructure, and add a dedicated UI check workflow; update build + typings config to support co-located specs.

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
yarn.lock	Adds UI testing/build tool dependencies (Jest, ts-jest, jsdom, babel-jest).
packages/ui/vite.config.ts	Points vite-plugin-dts at tsconfig.build.json to avoid emitting spec d.ts stubs.
packages/ui/test/mocks/styleMock.cjs	Adds CSS-module identity proxy for Jest runs.
packages/ui/src/index.ts	Makes EditorjsUI.destroy() remove the editor wrapper element.
packages/ui/src/index.spec.ts	Adds unit coverage for EditorjsUI wrapper attachment/removal.
packages/ui/src/Blocks/Blocks.ts	Aborts holder DOM listeners on destroy and detaches the holder from the DOM.
packages/ui/src/Blocks/Blocks.spec.ts	Adds unit coverage for block rendering, input remapping, undo/redo shortcuts, and destroy cleanup.
packages/ui/package.json	Adds Jest scripts + deps; ensures build runs workspace dependency builds first.
packages/ui/jest.config.ts	Introduces Jest+ts-jest+jsdom config (ESM-friendly) for UI package tests.
packages/ui/eslint.config.mjs	Allows @jest/globals imports in spec files under published-import rules.
openspec/specs/ui/spec.md	Updates UI spec to reflect destroy behavior and new test coverage.
.github/workflows/ui.yml	Adds UI package CI workflow using the shared package-check pipeline.
.github/actions/base-coverage/action.yml	Skips base coverage when the base ref lacks a test:coverage script (new test suites).

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