Flak clouds and hull-eating nanites

Weapons

• Caustic flak. Flak shells leave a damaging caustic cloud where they burst, drawn as drifting smoke puffs.
• Nanites eat the hull. Infected enemies now take damage over time, 4 per second at level 1 and 1.5 more per level. Each level also raises the damage they take by 10% (was 5%) and lets the swarm spread 30 px farther.
• Vapor Screen. Vapor banks are far more see-through, evenly from edge to core, and boss guns no longer show through them. Cloud synergies no longer use up the bank when they trigger.
• Balloon mines. Blast radius drops from 95 to 70 px, and an armed mine is easy to spot at a glance.
• Gravity Well. Pull radius drops from 150 to 110 px and grows 15 px per level instead of 25. Wells no longer drag the guns off bosses.
• Seekers. They turn tighter.

Bosses

• The Revolver. It dies when its bar actually fills, and regrown guns properly add to its health.

Interface

• Synergy readout. The HUD lists your active synergies during a run.
• Marked supply crates. A crate shows its payload the whole way down: green with a cross for a repair, amber with a chevron for a damage boost.
• Gallery. Every weapon demo has a level slider and level-aware stats, and sits on a hot-pink backdrop so effects read clearly.
• Options. Rows drop their filler descriptions.

Fixes

• Gravity Fuze. It arms only after the shell clears the muzzle.
• Game page. Refreshing the game page no longer crashes it, and missing sounds are back.