[Remove Vuetify from Studio] Layout and input on the Collection > Select channels page

[Swoyamjeetcodes]

Summary

This PR removes Vuetify usage from the layout and input in the Collection → Select channels selection list, per issue scope.

Changes made:

• Replaced LoadingText with StudioLargeLoader and useKShow(..., 400) for minimum visible loader time.
• Replaced Checkbox with KCheckbox.
• Replaced VTextField with KTextbox.
• Replaced local VContainer / VLayout usage in ChannelSelectionList with custom scoped styles and div layout.
• Kept channel card refactor out of scope (no card changes).

Behavior preserved:

• Search filtering works as before.
• Selecting/deselecting works via checkbox click.
• Selecting/deselecting works via channel item click.
• Empty-search state still displays “No channels found”.

Tests/verification:

• Updated channelSelectionList.spec.js to mock useKShow.
• Added loader test for loading state behavior.
• Ran:
  • pnpm exec eslint contentcuration/contentcuration/frontend/channelList/views/ChannelSet/ChannelSelectionList.vue contentcuration/contentcuration/frontend/channelList/views/ChannelSet/__tests__/channelSelectionList.spec.js
  • pnpm test -- contentcuration/contentcuration/frontend/channelList/views/ChannelSet/__tests__/channelSelectionList.spec.js contentcuration/contentcuration/frontend/channelList/views/ChannelSet/__tests__/channelSetModal.spec.js
  • pnpm run build

Manual verification:

1. Login as user@a.com / a.
2. Go to Channels → Collections.
3. Click New collection.
4. Click Select channels.
5. Verify loader, search, selection via checkbox, selection via row click, and empty search state.

Screenshots:

Scenario	Screenshot
Select channels — Initial load
Select channels — Default list
Select channels — Filtered / Empty result

References

• Closes [Remove Vuetify from Studio] Layout and input on the Collection > Select channels page #5774
• Part of Open-Source Community Project: Remove Vuetify from Studio in favor of Kolibri Design System #5060

Reviewer guidance

Please verify:

• Loader uses minimum visible time behavior (useKShow(..., 400)).
• Checkbox and row click selection interactions still match previous behavior.
• Search and empty-state behavior are unchanged.
• No channel card refactor was introduced.
• No ::v-deep or /deep/ selectors were added.

AI usage

I used Codex (generative AI) to help implement and iterate this change, including component replacement and test updates.

DEEP disclosure:

• Disclose: AI was used for implementation support and troubleshooting local setup/build issues.
• Engage critically: I reviewed generated code for correctness and scope, ensuring no card refactor or unrelated changes were introduced.
• Edit: I refined AI-generated output (including styles and test updates) and removed/avoided out-of-scope changes.
• Process sharing: AI was used for drafting code and test scaffolding; final verification was done manually with local UI checks, linting, tests, and build.

[learning-equality-bot]

👋 Hi @Swoyamjeetcodes, thanks for contributing!

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• Pull request description has correctly filled AI usage section & follows our AI guidance:

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[learning-equality-bot]

📢✨ Before we assign a reviewer, we'll turn on @rtibblesbot to pre-review. Its comments are generated by an LLM, and should be evaluated accordingly.

[learning-equality-bot]

📢✨ Before we assign a reviewer, we'll invite community pre-review. See the community review guidance for both authors and reviewers.

[rtibblesbot]

Clean, well-scoped migration from Vuetify to KDS components. All replacements match the issue spec.

CI passing. Screenshots verified — loader, channel list, search, and empty state all render correctly.

• suggestion: One Vuetify utility class (grey--text) remains — see inline comment
• praise: Good RTL-aware styling and solid loader test coverage

---

@rtibblesbot's comments are generated by an LLM, and should be evaluated accordingly

How was this generated?

Reviewed the pull request diff checking for:

• Correctness: bugs, edge cases, undocumented behavior, resource leaks, hardcoded values
• Design: unnecessary complexity, naming, readability, comment accuracy, redundant state
• Architecture: duplicated concerns, minimal interfaces, composition over inheritance
• Testing: behavior-based assertions, mocks only at hard boundaries, accurate coverage
• Completeness: missing dependencies, unupdated usages, i18n, accessibility, security
• Principles: DRY (same reason to change), SRP, Rule of Three (no premature abstraction)
• Checked CI status and linked issue acceptance criteria
• For UI changes: inspected screenshots for layout, visual completeness, and consistency

[rtibblesbot]

suggestion: grey--text is a Vuetify utility class (defined in vuetify.scss). Since this PR is removing Vuetify from this component, consider replacing it with a scoped style — e.g., add color: #9e9e9e; to the .no-channels-found rule (which already targets this element) and drop the class.

[MisRob]

The suggestion to remove Vuetify utility class is correct, however e.g., add color: #9e9e9e; is not ~ we don't use hardcoded colors. KDS colors need to follow this guidance https://design-system.learningequality.org/colors.