fix(patch): cherry-pick ba15eeb to release/v0.15.0-pr-13083 to patch version v0.15.0 and create version 0.15.1

[gemini-cli-robot]

This PR automatically cherry-picks commit ba15eeb to patch version v0.15.0 in the stable release to create version 0.15.1.

[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 introduces a patch release v0.15.1 by cherry-picking a specific commit. The core changes focus on enhancing the user experience within the CLI's terminal interface, particularly concerning mouse interactions and screen management. It addresses potential confusion around text selection by providing explicit warnings and refines the behavior of the clear command to be more robust in different terminal buffer states.

Highlights

• Improved Mouse Event Handling: Mouse event handlers now return a boolean indicating if they've handled an event, allowing for better event propagation control and preventing unintended side effects.
• Selection Warning: A new selectionWarning state and UI prompt have been added to inform users when a mouse drag for text selection is not functioning as expected in the terminal, guiding them to use Ctrl+S for selection mode.
• Conditional Console Clear: The /clear command now intelligently avoids calling console.clear() when an alternate terminal buffer is active, preventing unintended screen clearing and improving user experience.
• Help Menu Update: The help menu has been updated to include new keyboard shortcuts for Ctrl+S (selection mode) and Page Up/Down (scrolling).

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[gemini-code-assist]

Code Review

This pull request cherry-picks a feature to improve user experience around text selection. It introduces a "selection warning" that intelligently detects when a user might be trying to select text with the mouse and provides a helpful tip on how to enter selection mode. The implementation is solid, modifying mouse event handlers to propagate an "event handled" status and using a central provider to trigger the warning. The changes are consistent, well-tested, and include a related fix for console.clear behavior in alternate buffer mode. The code quality is high, and I did not find any issues that meet the required severity level of high or critical.

[github-actions]

Size Change: +2.08 kB (+0.01%)

Total Size: 20.5 MB

Filename	Size	Change
./bundle/gemini.js	20.5 MB	+2.08 kB (+0.01%)

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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