v0.4.6 — Sessions loading verified + Play Store improvements

• Sessions loading regression: previous fix was validated by a broken test.
  Test now requires a pre-existing session to appear on connect — confirmed
  working in CI (CUA sessions_reload phase: PASS).
• Test also verifies sessions remain visible after navigating back from a
  session chat view.
• Updated support email to support@agentlabs.cc
• Descriptions rewritten: clearer opencode serve remote control model,
  Tailscale as recommended connectivity
• New screenshots and 10x speed demo video