Polish Chat Model Picker Unavailable Entries

[isidorn]

Summary

• adjust unavailable model wording from "Contact admin" to "Contact your admin"
• change model picker filter placeholder from "Search models..." to "Search models"
• cap displayed recently used models at 4 instead of 5
• remove warning icon for unavailable "Update VS Code" and "Contact your admin" rows

Validation

• ./scripts/test.sh
• VS Code - Build watch tasks (Core - Transpile, Core - Typecheck, Ext - Build)

[Copilot]

Pull request overview

This PR polishes the chat model picker UI/UX by refining unavailable-model messaging, search placeholder text, the “recently used” cap, and iconography to reduce visual noise.

Changes:

• Update model picker strings (e.g., “Contact your admin”, “Search models”).
• Reduce displayed “recently used” model IDs from 5 to 4.
• Remove warning icons from the “Update VS Code” and “Contact your admin” unavailable rows (showing a blank icon instead).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/vs/workbench/contrib/chat/common/languageModels.ts	Caps the returned recently-used model IDs to 4 entries.
src/vs/workbench/contrib/chat/browser/widget/input/chatModelPicker.ts	Adjusts unavailable row wording, removes warning icon usage for certain unavailable entries, and updates the filter placeholder string.

[Copilot]

getRecentlyUsedModelIds() is now hard-limited via .slice(0, 4), but the public interface documentation above still mentions a maxCount parameter (default 7). That JSDoc is misleading for consumers of ILanguageModelsService and should be updated (or the API should actually accept a maxCount argument) so documentation matches behavior.

Suggested change

	.slice(0, 4);
	.slice(0, 7);

[sandy081]

no need to send a blank icon if we do not have icon