Redesign the mod menu

The mod menu is now a translucent panel beside a navigation rail, with a
header showing how many mods are enabled, a search box, category filters
built from the mods' tags and a three-column grid of mod cards. Each card
shows the mod's icon, name and description with a settings button and an
on/off switch. The layout shrinks to fit smaller windows.

New reusable pieces: Panel, Label, ChipGroup, SearchInput,
Toggle.drawSwitch, Theme helpers for panel, border, muted text and body
font, and Fonts.ellipsize. The sidebar and card icons are Lucide SVGs, and
seven mod icons were redrawn in the same style.

Scroll can skip its background and be cleared, and no longer passes clicks
outside its bounds to children scrolled out of view. Input checks overflow
and places the cursor at the scale its text is drawn at. Screens that are
not redesigned yet move the wider sidebar so it keeps its gap.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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src/main/resources/assets/saturnclient/textures/gui/components/cosmetics.svg

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src/main/resources/assets/saturnclient/textures/gui/components/mods.svg

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src/main/resources/assets/saturnclient/textures/gui/components/search.svg

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src/main/resources/assets/saturnclient/textures/gui/components/settings.svg

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