Show devtools in staging

[ComputelessComputer]

Allow the staging bundle id to enable the devtools panel visibility gate.

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Note

Low Risk
Small visibility-gating change for an internal staging bundle; production bundle behavior is unchanged aside from the command now requiring AppHandle.

Overview
Staging builds (com.hyprnote.staging) can now pass the frontend devtools visibility check, not only debug/dev/devtools compile-time builds.

show_devtool takes AppHandle and reads app.config().identifier via a new should_show_devtool helper (with STAGING_BUNDLE_ID). Specta registration is updated for the generic command signature, and a unit test asserts staging returns true.

^{Reviewed by Cursor Bugbot for commit caec0c9. Bugbot is set up for automated code reviews on this repo. Configure here.}

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