Replace 3-column glassmorphic card wall with centered single-column
tabbed interface. Horizontal pill tab bar (Connections, Downloads,
Library, Appearance, Advanced) with category switching.
- Kill glassmorphic cards, accent gradient bars, and box shadows
- Clean section headers with subtle dividers
- Horizontal setting rows (label left, control right)
- Custom styled select dropdowns with SVG arrow
- Quality Profile moved into Downloads tab (conditionally visible)
- Help text wraps to new line below controls
- Path inputs and template inputs properly styled
- Mobile responsive (rows stack, tab bar scrolls)
- Zero functional changes — all element IDs and JS logic preserved
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