sessionResetKeys() read scene_refinement_keys from the cached preview,
which can lag the prompt (debounced refresh; _distributeGlobalPrompt
carries the old keys forward until a follow-up preview). A just-added
key-bound shortcut was therefore absent from the reset list, so the modal
only offered to wipe "default". resetStudioSession() now awaits
refreshPreview(true) before reading the keys.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>