[mcagnion]

Description of the problem being solved:

Mana-Infused Staff is correctly disabled when Blood Magic leaves the character with no mana, but the disable decision introduced by #10283 happened after its forced mana percentage had already been added to the reservation aggregate and breakdown. This left a disabled skill represented as a 30% mana reservation during the zero-mana calculation pass.

This change moves the forced-mana availability check before reservation processing and strengthens the focused system test for the per-skill fields, player aggregate, final output, and Mana Reserved breakdown.

Steps taken to verify a working solution:

• With a valid staff and Arrogance, Mana-Infused Staff remains enabled, reserves 30% of mana, and reserves no life.
• When Blood Magic leaves the character with no mana, the skill is disabled without contributing to the reservation aggregate, final output, or Mana Reserved breakdown.
• After switching from staff to non-staff and back, the reservation state and breakdown are cleared and rebuilt correctly.
• The updated system regression test confirms that the disabled skill leaves no mana reservation aggregate, output, or breakdown entry.
• The zero-mana result was also verified in the Windows UI.

The full suite was not run locally for this narrow follow-up. No UI layout or text is changed.

AI-assisted contribution disclosure: This change was developed and reviewed with OpenAI Codex and confirmed with focused automated tests and manual UI verification.