better progress rendering for thinking vs. normal progress

[justschen]

fixes issue where it's hard to tell what is progress, and what is clickable.

[Copilot]

Pull request overview

This PR aims to make chat “thinking” vs. “working/progress” states easier to distinguish in the chat UI so progress rows read less like clickable items.

Changes:

• Updates the thinking header labeling to default to “Thinking”, with a switch to “Working” after tool calls begin.
• Allows the generic “working” progress row to use the existing chat.agent.thinking.phrases configuration (append/replace) for its label.
• Refines the configuration descriptions for chat.agent.thinking.phrases to cover progress indicators.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
src/vs/workbench/contrib/chat/browser/widget/chatContentParts/chatThinkingContentPart.ts	Adjusts default thinking header text and dynamically shifts header prefix when tool calls appear.
src/vs/workbench/contrib/chat/browser/widget/chatContentParts/chatProgressContentPart.ts	Uses chat.agent.thinking.phrases to pick a “Working” label for the working progress row.
src/vs/workbench/contrib/chat/browser/chat.contribution.ts	Updates configuration descriptions for thinking/loading phrase customization to include progress indicators.

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