AH: fix client side tools not getting auto approved

[justschen]

fix #322557

[Copilot]

Pull request overview

Fixes client-contributed tool calls (e.g. Playwright) still showing approval prompts when the session is in Bypass Approvals mode by stamping autoApproveBySetting onto the initial chat/toolCallStart action so the workbench can auto-approve client-side confirmations.

Changes:

• Stamp autoApproveBySetting: true into _meta for client-contributed ChatToolCallStart actions when autoApprove === 'autoApprove'.
• Apply the stamping consistently in both the “no active turn” and “active turn” action dispatch paths.
• Add unit tests covering client vs non-client tool starts under bypass vs default approval settings.

Show a summary per file

File	Description
src/vs/platform/agentHost/node/agentSideEffects.ts	Adds _stampClientToolAutoApprove and routes dispatched actions through it to propagate bypass-approval intent for client tools.
src/vs/platform/agentHost/test/node/agentSideEffects.test.ts	Adds regression tests ensuring autoApproveBySetting is stamped only for client tool starts under bypass approvals.

Copilot's findings

• Files reviewed: 2/2 changed files
• Comments generated: 0