fix #302202 fix #301997 Deduplicate consecutive carousel images and add title fallback

[rebornix]

No description provided.

[Copilot]

Pull request overview

Fixes image carousel UX issues in the chat workbench by removing redundant consecutive images and ensuring a stable, user-friendly collection title when section titles are empty.

Changes:

• Deduplicate consecutive images with identical URIs within each collected carousel section.
• Add a default/fallback collection title for single-section carousels when the section title is empty.
• Add tests for consecutive vs non-consecutive duplicate image URIs in collectCarouselSections.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/vs/workbench/contrib/chat/browser/chatImageCarouselService.ts	Adds consecutive-URI deduping when building carousel sections and introduces a default title fallback in buildCollectionArgs.
src/vs/workbench/contrib/chat/test/browser/chatImageCarouselService.test.ts	Adds unit tests validating consecutive URI deduplication behavior and that non-consecutive duplicates are preserved.

Comments suppressed due to low confidence (2)

src/vs/workbench/contrib/chat/test/browser/chatImageCarouselService.test.ts:238

• references entries are missing the required kind: 'reference' field for IChatContentReference, which will cause TypeScript to fail to compile these tests. Update each reference object to include kind: 'reference' (and keep reference: uri as-is).

				makeImageVariableEntry({
					value: new Uint8Array([1, 2, 3]),
					references: [{ reference: uri }],
				}),
				makeImageVariableEntry({
					id: 'img-2',
					value: new Uint8Array([1, 2, 3]),
					references: [{ reference: uri }],
				}),

src/vs/workbench/contrib/chat/test/browser/chatImageCarouselService.test.ts:256

• references: [{ reference: ... }] is missing kind: 'reference' required by IChatContentReference, so this test code won't type-check. Include kind: 'reference' on each reference object.

				makeImageVariableEntry({
					value: new Uint8Array([1, 2, 3]),
					references: [{ reference: uri }],
				}),
				makeImageVariableEntry({