Apply glassmorphism styling to event cards on list view

Replace solid white event cards with glass-effect cards featuring
backdrop blur, semi-transparent gradient backgrounds, and light
borders that blend with the Electric Dusk gradient background.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.specify/memory/research/modern-ui-effects.md

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+# Modern UI Effects Research (2025-2026)
+
+## Liquid Glass (Apple WWDC 2025)
+Evolved glassmorphism with directional lighting. Three-layer approach: highlight, shadow, illumination.
+- `backdrop-filter: blur(20px) saturate(1.5)` — higher saturation than basic glass
+- `inset 0 1px 0 rgba(255,255,255,0.15)` — top highlight (light direction)
+- `inset 0 -1px 0 rgba(0,0,0,0.1)` — bottom shadow
+- Outer drop shadow for depth: `0 8px 32px rgba(0,0,0,0.3)`
+- Advanced: SVG `feTurbulence` + `feSpecularLighting` for refraction (Chromium only)
+- Browser support: `backdrop-filter` ~88%, Firefox since v103
+
+## Aurora / Gradient Mesh Backgrounds
+Stacked animated radial gradients simulating northern lights. Pairs well with glass cards on dark backgrounds.
+- Multiple `radial-gradient(ellipse ...)` layers with partial opacity
+- Animated via `background-position` shift (GPU-friendly)
+- `@property` rule enables direct gradient color animation (broad support since 2024)
+- Best for ambient background movement, not for content areas
+
+## Animated Glow Borders
+Rotating `conic-gradient` borders with blur halo. Striking on dark backgrounds.
+- Outer wrapper with `conic-gradient(from var(--angle), color1, color2, color3, color1)`
+- `::before` pseudo with `filter: blur(12px)` and `opacity: 0.5` for glow halo
+- `@property --angle` trick to animate custom property inside `conic-gradient`
+- Use sparingly — best for single highlight elements (FAB, CTA), not all cards
+
+## Modern Neumorphism (2025-2026 revision)
+Subtler than the original trend. Higher contrast, less extreme extrusion, combined with accent colors.
+- Light and dark shadow pair: `6px 6px 12px rgba(0,0,0,0.5)` + `-6px -6px 12px rgba(60,50,80,0.15)`
+- `border: 1px solid rgba(255,255,255,0.05)` for definition
+- Works on dark backgrounds with slightly lighter "uplift" shadow direction
+- Better suited for interactive elements (buttons, toggles) than content cards
+
+## Sources
+- Apple Liquid Glass CSS: dev.to/gruszdev, dev.to/kevinbism, css-tricks.com, kube.io
+- Aurora: dev.to/oobleck, daltonwalsh.com, github.com/mattnewdavid
+- Glow borders: frontendmasters.com (Kevin Powell), docode.co.in
+- Trends overview: medium.com/design-bootcamp, index.dev, bighuman.com