feat(extensions): add 'delete' as an alias for /extensions uninstall

[martin-hsu-test]

Summary

Many users instinctively reach for delete instead of uninstall when trying to remove an extension. This PR adds delete as an alias on the /extensions uninstall slash command, removing a small but real friction point.

Fixes #21328

Implementation

Single-line change: add altNames: ['delete'] to uninstallCommand in packages/cli/src/ui/commands/extensionsCommand.ts.

This mirrors the existing pattern already used in the same file by reloadCommand:

const reloadCommand: SlashCommand = {
  name: 'reload',
  altNames: ['restart'],
  ...
};

The canonical name (uninstall) shown in help text and usage strings is unchanged, consistent with how reloadCommand exposes its restart alias.

Behavior

After this change, all of the following are equivalent:

/extensions uninstall my-ext
/extensions delete my-ext
/extensions uninstall --all
/extensions delete --all

Tests

Added a unit test asserting the alias is exposed:

it('should expose "delete" as an alias', () => {
  const uninstallCmd = extensionsCommand(true).subCommands?.find(
    (cmd) => cmd.name === 'uninstall',
  );
  expect(uninstallCmd?.altNames).toContain('delete');
});

All existing extension command tests continue to pass:

✓ packages/cli/src/ui/commands/extensionsCommand.test.ts (59 tests) 38ms
Test Files  1 passed (1)
     Tests  59 passed (59)

tsc --noEmit and eslint both pass with zero output.

Notes

• The CLI subcommand gemini extensions uninstall (non-interactive) is not changed — only the interactive slash command. This matches the issue scope.
• I considered also adding remove as an alias (common in npm/apt/brew), but stuck strictly to what the issue requested.

[gemini-code-assist]

Summary of Changes

Hello, 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 improves the usability of the extension management interface by introducing a common synonym for the uninstall command. By allowing users to use 'delete' interchangeably with 'uninstall', the change reduces friction for users who rely on intuitive command naming conventions.

Highlights

• Command Alias Addition: Added 'delete' as an alias for the '/extensions uninstall' slash command to improve user experience.
• Test Coverage: Added a new unit test to verify that the 'delete' alias is correctly registered for the uninstall command.

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[gemini-code-assist]

Code Review

This pull request adds "delete" as an alias for the "uninstall" extension command and includes a corresponding unit test to verify the alias is correctly exposed. I have no feedback to provide.