v0.5.0

Release v0.4.0: Aether 1.2.0, MASQUE transport choice, app logo

Aether core updated to v1.2.0 (SHA256-verified):
- data-plane validation no longer false-positives: the probe now targets
  an external resolver (1.1.1.1 was inside Cloudflare's own network, so a
  gateway could "pass" without reaching the real internet) and requires
  two consecutive round-trips - fixes "connected but traffic hangs"
- new MASQUE transport choice: HTTP/3 (QUIC, default) or HTTP/2 (TCP)

GUI integration of the transport choice:
- new "MASQUE Transport" toggle in the Advanced panel (HTTP/3 default),
  disabled mid-session and when the protocol is WireGuard/gool;
  persisted with the rest of the profile (serde default keeps old saved
  profiles loading cleanly)
- passed via the AETHER_MASQUE_HTTP2 env var, not a flag: there is no
  --h3 flag, and setting the env to any value also suppresses 1.2.0's
  new interactive "MASQUE transport" prompt in both directions (without
  this, every MASQUE connect would hit a prompt the GUI has to answer)
- prompts.rs gains a fallback rule answering that menu if it ever
  appears anyway; the rest of the 1.2.0 CLI surface is byte-identical
  to 1.1.1 (verified by diffing upstream cli.rs)

App icon:
- new meteor logo (src-tauri/icons/logo.png) applied across the full
  generated icon set (ico/icns/png + platform stores) via tauri icon

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>