FillPicker.vue (504 → 121 lines): dumb tab switcher, no gradient
internals. Delegates entirely to sub-components.
New GradientEditor.vue (227 lines): owns gradient stops, stop bar
with pointer drag, subtype select, and HsvColorArea for active stop.
Uses AppSelect instead of hand-rolled Reka UI Select.
New ImageFillPicker.vue (79 lines): image preview, file picker,
scale mode select via AppSelect.
Each component owns its full concern — no data leaking between them.
Replaced inline SVGs with Lucide icons, use twMerge for tab classes.
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