chore: Remove some legacy studio components

[lassopicasso]

Description

• Replaced legacy StudioHeading one place, see image before and after.
• Remove legacy StudioHeading, StudioIconTextfield, StudioToggleableTextfield and StudioToggleableTextfieldSchema

Not necessary to test this PR, and code review can mostly be ContentLibrary.tsx

Before image

After image:

Verification

• Related issues are connected (if applicable)
• Your code builds clean without any errors or warnings
• Manual testing done (required)
• Relevant automated test added (if you find this hard, leave it and we'll help out)

[coderabbitai]

📝 Walkthrough

Walkthrough

Removed multiple deprecated legacy UI components, their stories, tests, docs and styles from the studio-components-legacy package; updated a consumer to import StudioHeading from the new package and added explicit props for the 404 heading.

Changes

Cohort / File(s)	Summary
Heading export removal & consumer update src/Designer/frontend/libs/studio-components-legacy/src/components/StudioHeading/index.tsx, src/Designer/frontend/libs/studio-content-library/src/ContentLibrary/ContentLibrary.tsx	Deleted legacy StudioHeading re-export. Updated ContentLibrary.tsx to import StudioHeading from @studio/components and added explicit props (data-size='xl', level={1}) for the 404 branch.
StudioIconTextfield — component, stories, docs, styles, tests, index src/Designer/frontend/libs/studio-components-legacy/src/components/StudioIconTextfield/StudioIconTextfield.tsx, .../StudioIconTextfield/index.ts, .../StudioIconTextfield/StudioIconTextfield.stories.tsx, .../StudioIconTextfield/StudioIconTextfield.test.tsx, .../StudioIconTextfield/StudioIconTextfield.mdx, .../StudioIconTextfield/StudioIconTextfield.module.css	Removed the StudioIconTextfield component and its private IconLabel, deleted associated type exports, Storybook stories, MDX docs, unit tests, and CSS rules.
StudioToggleableTextfield — component, stories, tests, index, CSS src/Designer/frontend/libs/studio-components-legacy/src/components/StudioToggleableTextfield/StudioToggleableTextfield.tsx, .../StudioToggleableTextfield/index.ts, .../StudioToggleableTextfield/StudioToggleableTextfield.stories.tsx, .../StudioToggleableTextfield/StudioToggleableTextfield.test.tsx, .../StudioToggleableTextfield/StudioToggleableTextfield.module.css	Removed the toggleable textfield component and its exported props; deleted Storybook stories, unit tests, and a single CSS rule for .propertyButton.
StudioToggleableTextfieldSchema — schema validator, component, stories, tests, docs, index src/Designer/frontend/libs/studio-components-legacy/src/components/StudioToggleableTextfieldSchema/JsonSchemaValidator.ts, .../StudioToggleableTextfieldSchema/StudioToggleableTextfieldSchema.tsx, .../StudioToggleableTextfieldSchema/index.ts, .../StudioToggleableTextfieldSchema/StudioToggleableTextfieldSchema.stories.tsx, .../StudioToggleableTextfieldSchema/StudioToggleableTextfieldSchema.test.tsx, .../StudioToggleableTextfieldSchema/StudioToggleableTextfieldSchema.mdx, .../JsonSchemaValidator.test.ts	Removed JsonSchemaValidator utility and the schema-wrapping StudioToggleableTextfieldSchema component and types; deleted associated index re-exports, Storybook stories, MDX docs and unit tests.
Legacy components barrel src/Designer/frontend/libs/studio-components-legacy/src/components/index.ts	Removed re-exports for StudioHeading, StudioIconTextfield, StudioToggleableTextfield, and StudioToggleableTextfieldSchema from the legacy components index barrel.

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~45 minutes

Suggested labels

area/ui-editor

Suggested reviewers

• Jondyr

Poem

🐰 A tidy hop across old code tonight,
Removing nests that no longer fit quite right,
Headings moved and stories shelved away,
The rabbit hops on, light as hay. ✨

Pre-merge checks

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The PR description identifies the changes (legacy component removal and replacement) and provides visual evidence, but lacks structured detail about impacts and testing scope.	Clarify which components depend on the removed legacy components, confirm no breaking changes exist, and explain why automated tests were not added despite significant removals.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'chore: Remove some legacy studio components' accurately summarizes the main change: removal of multiple deprecated legacy components from the studio-components-legacy library.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.24%. Comparing base (788c6d9) to head (e90feeb).
⚠️ Report is 65 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17361      +/-   ##
==========================================
- Coverage   96.26%   96.24%   -0.03%     
==========================================
  Files        2384     2392       +8     
  Lines       30282    30380      +98     
  Branches     3529     3542      +13     
==========================================
+ Hits        29150    29238      +88     
- Misses        820      832      +12     
+ Partials      312      310       -2     

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[JamalAlabdullah]

nice! 👍