Update boot-splash and explore headers theme

[dylanjeffers]

Note

Medium Risk
Primarily UI/UX changes across mobile and web; risk is moderate because it removes a feature-flagged animated header/scroll behavior and updates native splash assets, which could impact layout or launch visuals if not tested on both platforms.

Overview
Updates mobile bootsplash assets and theme colors on both Android and iOS (new background/primary colors, new iOS logo asset set, and a generated assets/bootsplash/manifest.json), and documents the regeneration workflow in packages/mobile/README.md.

Refactors the mobile Explore/Search UI by removing the collapsed/animated header and reanimated scroll handling/feature flag wiring; the header becomes a simple static TextInput + filters bar (with safer scrollTo calls) and SearchExploreScreen uses a plain IOScrollView when showing Explore content.

On web, the desktop Explore hero background is switched from an imported asset to a public URL (landing-2026/landing.png) to work across Vite entry points, and the mobile Explore page now uses the shared mobile header (HeaderContext/hasDefaultHeader) instead of banner image preloading.

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Latest commit: 579db55

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iOS boot splash loses dark mode logo variant

Medium Severity

The old BootSplashLogo-ee25c4 imageset included six entries — three universal plus three with "appearance": "luminosity", "value": "dark" — providing a separate dark mode logo. The replacement BootSplashLogo-c87469 imageset only has three universal entries with no dark appearance variants. The dark mode background is now pure black (#000000), yet the same light-mode logo will be displayed. Android still ships separate drawable-night-* logo assets, so the platforms are now inconsistent. Depending on the logo's colors, it may be invisible or poorly visible on the black iOS dark-mode splash screen.