[christmas] Upgrade Bevy to 0.19, rework snowfall to per-flake elements, and polish reveal ring entrance animations

[gazure]

Upgrades Bevy from 0.18.1 to 0.19.0, along with all dependent crates that track Bevy's release cycle (accesskit, wgpu, naga, naga_oil, alsa, rodio, cpal, taffy, sysinfo, and others). The new bevy_material, bevy_clipboard, bevy_world_serialization, and bevy_scene_macros crates introduced in 0.19.0 are pulled in as part of the update. bevy_text now uses parley instead of cosmic-text, and bevy_mesh gains a dependency on glam 0.32. Several previously bundled dependencies (bindgen, oboe, coreaudio-sys, nom 7, itertools 0.13, simd_cesu8) are removed.

Alongside the dependency bump, the Christmas page receives several UI improvements:

• Snowfall: Replaces the three tiled gradient layers with 90 individually styled <span> elements. Each flake has its own size, speed, horizontal drift, and phase computed from a deterministic hash so server and browser renders agree. Fall and sway run as separate CSS animations on translate and transform respectively so both compose on a single element.
• Reveal ring: Names are now hidden until called rather than shown dimmed from the start, preventing participants from reading ahead. Each name gets a scale-in entrance animation (name-in) on the beat it is first spoken. Node radius shrinks for empty seats to preserve the ring's shape without implying occupancy. The is_named and is_arriving helpers are extracted as public functions with unit tests covering the full reveal sequence.
• Ceremony page: Removes the keyboard hint paragraph from the controls area.
• CSS: Adds the name-in keyframe, adjusts waiting-node opacity from 0.5 to 0.35, removes the .reveal-hint rule, and fixes the reveal grid to four rows instead of five.

[gazure]

• [christmas] Upgrade Bevy to 0.19, rework snowfall to per-flake elements, and polish reveal ring entrance animations #391 👈 (View in Graphite)
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[gazure]

Merge activity

• Jul 26, 7:48 PM UTC: @gazure merged this pull request with Graphite.