Don't crash when no installable drive is detected

[szpoont]

disk_form handed an empty list to 'gum choose' when no disk was found, which aborts with a no-options error. Scan inside a loop and, if no drives are detected, prompt to rescan for a hot-plugged drive or abort cleanly instead of crashing.

fixes omacom/omarchy#7719

[greptile-apps]

Greptile Summary

The PR prevents disk selection from invoking gum choose without options and allows hot-plugged drives to be discovered without restarting the installer.

• Moves installable-drive discovery into a rescan loop.
• Offers explicit rescan and clean-abort actions when no eligible drive exists.
• Preserves the existing disk formatting and selection behavior once a drive is found.

Confidence Score: 5/5

The PR appears safe to merge, with no concrete blocking or independently actionable non-blocking issue identified.

The empty-drive state now reaches an explicit rescan or clean-abort prompt, while successful scans continue through the existing disk-option construction and selection flow.

Important Files Changed

Filename	Overview
configs/airootfs/root/configurator	Adds a sound no-drive rescan/abort loop while retaining boot-device exclusion and the existing disk-selection contract.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  A[Scan installable drives] --> B{Any eligible drives?}
  B -- No --> C{Rescan or abort?}
  C -- Rescan --> A
  C -- Abort --> D[Exit installer cleanly]
  B -- Yes --> E[Build disk options]
  E --> F[Choose install disk]
  F --> G[Store selected disk]

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