Patch #10628 and #10514 into v0.8.0 preview

[chrstnb]

TLDR

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Reviewer Test Plan

Testing Matrix

	🍏	🪟	🐧
npm run	❓	❓	❓
npx	❓	❓	❓
Docker	❓	❓	❓
Podman	❓	-	-
Seatbelt	❓	-	-

Linked issues / bugs

[gemini-code-assist]

Summary of Changes

Hello @chrstnb, 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 streamlines the user experience for managing extensions by unifying the install command's input and providing more flexibility for the new command. It also significantly improves the robustness of archive extraction by migrating from external shell commands to native Node.js libraries, reducing potential platform-specific issues and enhancing overall stability.

Highlights

• Unified Extension Installation: The gemini extensions install command now accepts a single source argument, which intelligently determines if it's a GitHub URL or a local path, simplifying the command-line interface.
• Flexible Extension Creation: The gemini extensions new command has been enhanced to allow creating an empty extension directory with a default gemini-extension.json manifest if no template is specified.
• Improved Archive Extraction: The underlying mechanism for extracting archives (e.g., .tar.gz, .zip) has been updated to use native Node.js libraries (tar and extract-zip) instead of relying on external shell commands, improving cross-platform compatibility and reliability.
• Dependency Updates: The package-lock.json and packages/cli/package.json files have been updated to include new dependencies such as tar, extract-zip, @types/archiver, and archiver to support the new archive handling logic.

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[gemini-code-assist]

Code Review

This pull request introduces several valuable improvements to the extension management commands. The extensions install command is refactored to use a single source argument for both local paths and git URLs, simplifying its usage. The extensions new command is now more flexible, with the template argument being optional. A significant enhancement is the replacement of external tar and unzip commands with native Node.js libraries, which improves cross-platform compatibility and removes reliance on system-installed tools. The changes are accompanied by corresponding test updates. I have one high-severity suggestion to improve error handling in the install command to make it more robust and user-friendly.

[github-actions]

Size Change: +143 kB (+0.82%)

Total Size: 17.6 MB

Filename	Size	Change
./bundle/gemini.js	17.6 MB	+143 kB (+0.82%)

ℹ️ View Unchanged

Filename	Size
./bundle/sandbox-macos-permissive-closed.sb	1.03 kB
./bundle/sandbox-macos-permissive-open.sb	830 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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