feat!: remove the deprecated FileTabs component

[tenphi]

Stacked on #1289 — base that PR first, then this one. It is stacked only to avoid a modify/delete conflict on FileTabs.docs.mdx (#1289 moves that page, this PR deletes it). Nothing here depends on #1289 otherwise; happy to rebase onto main instead if you'd rather merge this first.

What

Removes FileTabs from the public API: the component, its FileTabs.TabPane subcomponent, the CubeFileTabProps type, its docs page, and its ESLint plugin fixture.

Why

• FileTabProps has carried @deprecated consider using <Tabs /> instead since before the Glaze migration.
• Cube Cloud is the only known consumer, and it stopped using it. FilesEditor was moved onto Tabs in cube-js/cloud@103e25e8e1 on 2025-10-24. Neither master (checked at today's HEAD) nor any branch there references FileTabs now.
• Nothing inside the UI Kit used it either — the only references were the barrel export in src/index.ts and one ESLint plugin fixture.

Migration

-<FileTabs defaultActiveKey="1" onTabClose={(key) => removeTab(key)}>
-  <FileTabs.TabPane id="1" title="index.ts" />
-</FileTabs>
+<Tabs defaultActiveKey="1" onDelete={(key) => removeTab(key)}>
+  <Tabs.Panel key="1" title="index.ts" />
+</Tabs>

The close button is the main thing to port: on Tabs it is onDelete, and passing it is what makes the buttons appear. Tabs has no built-in isDirty equivalent — render the unsaved indicator into the tab's title or actions, as Cloud's FilesEditor does.

Marked minor, matching how #1275 versioned removing public props (this repo is 0.x, so major would mean 1.0).

One thing worth a look

defaults.test.ts has a coverage ratchet, COVERED = 72, lowered here to 71. The guard exists to stop fixtures being dropped for components that still exist; removing a component shrinks total alongside covered, so it is not a coverage regression. I noted that in the comment rather than silently editing the number.

Verification

• pnpm test — 1361 passed, 1 skipped, 62 files
• pnpm lint — clean (only pre-existing consistent-token-usage warnings in untouched files)
• pnpm build — passes; FileTabs / CubeFileTabProps gone from dist/index.d.ts and dist/index.js
• tsc --noEmit — 13 errors, identical to origin/main, none mentioning FileTabs (pre-existing, not run in CI)
• defaults.generated.ts regenerated via pnpm audit-defaults

Related, not done here

StatsCard (the other organisms/ component) looks like the same situation — it is exported but unused by Cloud, which has its own local StatsCard built on the kit's Card. I left it alone since you only greenlit FileTabs; say the word and it can follow.

🤖 Generated with Claude Code

---

Note

Low Risk
Deletion of an already-deprecated, unused public API with migration notes; no runtime logic changes beyond removing dead code.

Overview
Removes the deprecated editor-style FileTabs component (including FileTabs.TabPane and CubeFileTabProps) from the public API, along with its Storybook docs and implementation under organisms/FileTabs.

Barrel exports in src/index.ts no longer expose the component or type. The ESLint defaults pipeline drops the FileTabs fixture and generated defaults entry; defaults.test.ts lowers the coverage ratchet from 72 to 71 with a comment that removing a component is not a regression.

The changeset (minor) documents migration to Tabs: onTabClose → onDelete, FileTabs.TabPane → Tabs.Panel, and unsaved state via custom title/actions since Tabs has no built-in isDirty.

^{Reviewed by Cursor Bugbot for commit e2f6a22. Bugbot is set up for automated code reviews on this repo. Configure here.}

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Project	Deployment	Actions	Updated (UTC)
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🦋 Changeset detected

Latest commit: e2f6a22

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@cube-dev/ui-kit	Minor

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📦 NPM canary release

Deployed canary version 0.0.0-canary-ea6c4d5.

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🏋️ Size limit report

Name	Size	Passed?
All	455.71 KB (-0.27% 🔽👏)	Yes 🎉
Tree shaking (just a Button)	118.94 KB (0% 🟰)	Yes 🎉

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