feat: default browser tool OFF by default; hide Browser auto-approve when disabled

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Implements Slack request: default browser tool to OFF on new installs and remove it from the auto-approval UI when disabled.

Summary of changes:

• Backend defaults: browserToolEnabled now defaults to false in provider state and webview post state (see ClineProvider and webviewMessageHandler).
• Prompt gating: canUseBrowserTool respects browserToolEnabled default OFF in Task and generateSystemPrompt.
• Webview initial state: browserToolEnabled set to false for fresh sessions.
• UI behavior: Auto-Approve dropdown and Settings filter out the Browser toggle when browser tool is disabled. Select All/None only affect visible toggles; counts and tooltip reflect visible set.

Notes:

• Existing user settings are preserved; change affects only unset values (new installs).
• Optional follow-up: when browserToolEnabled is turned OFF, we could also clear alwaysAllowBrowser to false to avoid latent state on re-enable.

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Important

This PR sets the default state of the browser tool to disabled and updates the UI to hide browser-related auto-approve options when the tool is disabled.

• Behavior:
  • Default browserToolEnabled to false in ClineProvider and webviewMessageHandler.
  • canUseBrowserTool in Task.ts and generateSystemPrompt.ts respects browserToolEnabled default OFF.
• UI:
  • AutoApproveDropdown.tsx and AutoApproveToggle.tsx filter out alwaysAllowBrowser when browserToolEnabled is false.
  • ExtensionStateContext.tsx initializes browserToolEnabled to false for new sessions.
• Misc:
  • Update logic in webviewMessageHandler.ts to handle browserToolEnabled state changes.

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Review Summary

No issues found. All changes look good:

• Backend defaults correctly changed from true to false for browserToolEnabled
• UI properly filters out browser-related auto-approve options when browser tool is disabled
• State initialization correctly defaults to false
• All changes are consistent and align with the PR goals

Follow Along on Roo Code Cloud

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Review complete. There are still 2 unresolved issues that need to be addressed.

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No issues found.