chat rendering fix for working + cli specific issues

[justschen]

fix issue with padding + working showing up DOUBLE

[Copilot]

Pull request overview

Adds an isAttachedToThinking flag to tool invocation parts so the chat renderer can correctly suppress the “working” progress indicator when a tool invocation is (or will be) rendered inside the Thinking container, and refines Thinking container behavior around single-item restoration.

Changes:

• Extend tool invocation model types with isAttachedToThinking and set/clear it during Thinking attachment transitions.
• Update Thinking container logic to track a single tool invocation item and only restore it to the main flow once the tool is complete.
• Adjust chat UI spacing and update affected tests/mocks.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/vs/workbench/contrib/chat/test/browser/widget/chatContentParts/chatSubagentContentPart.test.ts	Updates test mock tool invocations to include the new isAttachedToThinking field.
src/vs/workbench/contrib/chat/test/browser/agentSessions/agentSessionApprovalModel.test.ts	Updates test helper mock tool invocations to include isAttachedToThinking.
src/vs/workbench/contrib/chat/common/model/chatProgressTypes/chatToolInvocation.ts	Adds default isAttachedToThinking state to the ChatToolInvocation implementation.
src/vs/workbench/contrib/chat/common/chatService/chatService.ts	Extends IChatToolInvocation and IChatToolInvocationSerialized type definitions with the new field.
src/vs/workbench/contrib/chat/browser/widget/media/chat.css	Tweaks spacing for the progress container in the chat UI.
src/vs/workbench/contrib/chat/browser/widget/chatListRenderer.ts	Suppresses “working” when the last part is a tool invocation attached (or about to be attached) to Thinking; sets/clears the flag during render/transition.
src/vs/workbench/contrib/chat/browser/widget/chatContentParts/chatThinkingContentPart.ts	Tracks tool invocation attachment state and refines single-item restoration behavior based on tool completion.

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