fix(patch): cherry-pick 9cdb267 to release/v0.22.2-pr-15494 to patch version v0.22.2 and create version 0.22.3

[gemini-cli-robot]

This PR automatically cherry-picks commit 9cdb267 to patch version v0.22.2 in the stable release to create version 0.22.3.

[gemini-code-assist]

Summary of Changes

Hello @gemini-cli-robot, 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 automates the cherry-picking of a commit to create a patch version. The primary functional change involves the introduction of a useSnowfall React hook. This hook dynamically enhances the CLI's header with festive animated snowfall and holiday tree ASCII art, which activates under specific conditions such as the current date falling within the holiday season and the 'Holiday' theme being active. The animation is designed to be temporary, ceasing after a short duration or if a user begins interacting with the chat.

Highlights

• Automated Cherry-Pick: This pull request is an automated cherry-pick of commit 9cdb267 to patch version v0.22.2 and create version 0.22.3.
• Snowfall Animation Hook: Introduces a new useSnowfall React hook that provides animated snowfall effects and adds holiday-themed ASCII art to the CLI header.
• Conditional Animation Display: The snowfall animation and holiday trees are displayed only during the holiday season (December/January), when the 'Holiday' theme is active, and if a chat session has not yet started.
• Animation Duration Control: The animation automatically stops after 15 seconds to prevent prolonged distraction, ensuring a temporary festive experience.
• Comprehensive Test Coverage: New test files have been added to thoroughly verify the correct behavior and conditions for the useSnowfall hook.

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[gemini-code-assist]

Code Review

This pull request cherry-picks a commit to create a patch release. The main change is the introduction of a useSnowfall hook that adds a holiday-themed animation to the application header. The implementation is mostly correct, but I've found a high-severity issue regarding the use of an impure function for state updates in React, which can lead to incorrect behavior. My review includes a suggestion to fix this.

[github-actions]

Size Change: +3.76 kB (+0.02%)

Total Size: 21.6 MB

Filename	Size	Change
./bundle/gemini.js	21.6 MB	+3.76 kB (+0.02%)

ℹ️ View Unchanged

Filename	Size
./bundle/sandbox-macos-permissive-closed.sb	1.03 kB
./bundle/sandbox-macos-permissive-open.sb	890 B
./bundle/sandbox-macos-permissive-proxied.sb	1.31 kB
./bundle/sandbox-macos-restrictive-closed.sb	3.29 kB
./bundle/sandbox-macos-restrictive-open.sb	3.36 kB
./bundle/sandbox-macos-restrictive-proxied.sb	3.56 kB

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