School rename, hero-first base, Aspects starfield

Renamed two schools: Order is now Metal and Chaos is now Dark. Sheichi moved out of its old slot into Fate. The change ripples through hero data, sigil colors, panel theming, and a few UI labels, but it's pure relabeling — no mechanics moved. The new names sit better with where the spell identity has actually landed in playtesting.

Aspects, Spells, Craft, and Alchemy now follow whichever hero you have selected on the base screen. The school switcher is gone from those panels entirely — you pick a hero, you see their stuff. It removes a redundant decision the player had to make every time they opened a panel and lets the hero portrait do the work of telling you whose loadout you're editing.

The Aspects screen got a proper backdrop. A new StarfieldBackground component renders animated stars behind the aspect tree, and the tree itself now supports pinch-to-zoom on touch and explicit zoom buttons so you can navigate big trees without fighting the camera. Looks closer to what the screen has always wanted to be.

Nell and Tara got default activity cutscenes — three new panels for Tara, two for Nell — so they have proper introduction beats when the story reaches them. While I was in the cutscene player, I fixed a panel renderer distortion that was warping art on certain aspect ratios; panels now render at their intended proportions across screen sizes.