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Adds a 5th "Custom" option to the theme swatch grid alongside the existing 4 presets, opening a picker for all ~12 CSS custom properties (backgrounds, borders, text, three accent tiers, highlight, danger) plus a light/dark toggle for native control rendering. Persisted as a new users.custom_theme_colors JSONB column, validated server-side against exactly what a native <input type="color"> can ever produce. Colors survive switching to a preset and back, since there's no reason picking a preset for a moment should force redoing every color pick. Applied at runtime as inline custom properties on :root (presets stay static CSS) via a shared applyTheme() helper, which is also responsible for clearing those inline overrides when switching away -- otherwise they'd silently keep winning over whatever preset's own stylesheet values should apply next. Live preview on every color change; persists only on explicit "Save colors" (not per keystroke, since a color input fires continuously while dragging), and closing the modal without saving reverts the preview back to whatever's actually persisted. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>