Add native mac explorer trash shortcut

[parsakhaz]

Summary

• Add macOS Cmd+Delete / Cmd+Backspace support in the explorer to move selected items to Trash without a confirmation popup.
• Preserve confirmation prompts for plain Delete / Backspace, the inline trash button, and context-menu delete.
• Guard the no-confirm IPC path so Trash failures return an error instead of falling through to permanent deletion.

Validation

• pnpm typecheck passed
• pnpm lint passed with existing warnings
• Pre-commit hook reran typecheck and lint successfully

Notes

Manual macOS UI verification is still expected: select multiple explorer files, use Cmd+Delete / Cmd+Backspace, and confirm they move to Trash without a popup.

[parsakhaz]

@codex review

[parsakhaz]

@claude review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Hooray!

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