NodeWave v0.9.0

The app gets its icon and a splash screen, a clearer tab bar, a readable status bar, a more usable map, and a website.

Added

• The official icon inside the app: in the top bar next to the name, and on a splash screen at start (icon, name, version and nodewave.org; it fades after under two seconds or on a tap).
• Website in docs/ (English), served by GitHub Pages from main /docs on nodewave.org (CNAME), with screenshots of the app in use. The same screenshots are in the README and in fastlane/metadata/android/en-US/images/phoneScreenshots/ for F-Droid.
• A node set to a fixed position now shows that position as its own marker ("FIXED POSITION") and no longer follows the GPS.

Changed

• The tab bar marks the current section with a pill around the icon and a green bold label (no bar, no glow); the change is animated.
• Status and navigation bar icons are always light on the dark background (they were dark on dark with the phone in light theme).
• Map: labels of the vector map are drawn at half the size they had (they were poster-sized), and the buttons and chips over the map have a dark plate so they stay readable on a white map.

Debug-signed build for testing: it updates over the other NodeWave pre-releases. Not independently audited, see docs/SECURITY.md.