feat(cli): add animated spinner for WaitingForConfirmation state

[annasba07]

Summary

Replace the static '⠏' character with an animated spinner during the "Waiting for user confirmation" state. This provides better visual feedback that the CLI is still active and awaiting input.

Changes

• GeminiRespondingSpinner.tsx: Updated to show animated spinner for both Responding and WaitingForConfirmation states
• LoadingIndicator.tsx: Removed static '⠏' fallback since spinner now handles confirmation state
• LoadingIndicator.test.tsx: Updated mock and test assertions to reflect new animated behavior

Test plan

• All LoadingIndicator tests pass (16/16)
• Pre-commit hooks pass (eslint, prettier)
• Visual behavior: Spinner now animates during confirmation prompts instead of showing static character

Before/After

Before: Static '⠏' character during confirmation (no visual indication CLI is active)
After: Animated dots spinner during confirmation (consistent with Responding state)

Fixes #13395

[gemini-code-assist]

Summary of Changes

Hello @annasba07, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the user experience of the CLI by introducing an animated spinner during the "Waiting for user confirmation" state. This change ensures that users receive continuous visual feedback, making the application feel more responsive and active rather than appearing frozen while awaiting input.

Highlights

• Animated Spinner for Confirmation: Replaced the static '⠏' character with an animated spinner for the "Waiting for user confirmation" state in the CLI.
• Improved Visual Feedback: Provides better visual feedback to users, indicating that the CLI is active and awaiting input.
• Component Logic Update: Modified GeminiRespondingSpinner.tsx to activate the animated spinner for both Responding and WaitingForConfirmation streaming states.
• Code Simplification: Removed the static character fallback from LoadingIndicator.tsx as the spinner now handles the confirmation state directly.
• Test Updates: Updated LoadingIndicator.test.tsx to reflect the new animated behavior and ensure test coverage.

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[gemini-code-assist]

Code Review

This pull request improves the user experience by replacing a static character with an animated spinner during the 'Waiting for user confirmation' state. The changes are well-contained and correctly implemented across the GeminiRespondingSpinner, LoadingIndicator, and related test files. The code is cleaner as a result of moving state-dependent rendering logic into the GeminiRespondingSpinner component. I have one suggestion regarding accessibility for screen reader users, which I've detailed in a specific comment.

[gemini-code-assist]

The altText for the spinner is hardcoded to SCREEN_READER_RESPONDING. While this is correct for the Responding state, it's misleading for screen reader users when the state is WaitingForConfirmation. The accessible text should reflect that the CLI is waiting for user input, not generating a response. Please consider using a different altText for the WaitingForConfirmation state to improve accessibility.