Polish startup, settings, and releases

[kylepelham]

Summary

• restore saved built-in and custom themes before first paint
• show theme-aware workspace, engine, plugin, and thread-loading progress
• provide persisted controls for splash visibility, mascot motion, completion transition, maximum duration, and font
• include bounce, float, pulse, and still mascot modes plus wave, fade, and lift exits
• show settings header elevation only after scrolling and contain it to the content column
• keep toggle thumbs visible in both light and dark themes
• generate structured AI release notes from the previous published tag, PR metadata, contributors, and direct commits
• fall back to deterministic GitHub or commit notes if model inference is unavailable

Readiness

The application shell stays mounted underneath the overlay. Startup waits softly for frontend plugins and the active directory's first engine bootstrap, while the selected maximum duration keeps all waits fail-open. Saved splash visibility, mascot motion, theme, and font apply before Solid mounts.

Release tags now use GitHub Models with the workflow token and models: read permission; no additional API secret is required.

Validation

• bun run typecheck
• bun run test (116 passed)
• cargo test --manifest-path src-tauri/Cargo.toml (17 passed)
• bun run build
• isolated Tauri production build in src-tauri/target-splash-v5