docs: add desktop app screenshots

Sabiá had no screenshots at all before this, just the logo. Add
networks/attack/settings screenshots (light/dark, en/pt-BR) captured
from the real UI with synthetic audit fixtures (7 mock access points
across 2.4/5 GHz covering open/WEP/WPA/WPA2/WPA3/802.1X-Enterprise, mock
client stations, one crackable handshake — no real third-party network
data), and reference them from README.md, README.pt-BR.md,
docs/interface.md and docs/pt-BR/interface.md.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VAyr8d7HuAdUGB6aA5xmDD

README.md

@@ -6,6 +6,8 @@
 
 <p align="center"><b>English</b> · <a href="README.pt-BR.md">Português</a></p>
 
+<p align="center"><img src="docs/img/networks-light-en.png" width="900" alt="The Sabiá desktop app capturing Wi-Fi frames in monitor mode, showing visible networks with signal bars, channels, security badges and associated clients"><br><sub>The real interface running with synthetic audit data (simulated networks, no real third-party data).</sub></p>
+
 ---
 
 Sabiá brings together, in a single sweep, what tools like `airodump-ng`, `hcxdumptool`, `aircrack-ng` and `wifite` do separately — in one Rust binary, with no `libpcap` dependency:
@@ -68,6 +70,8 @@ Authorized deauthentication testing and all other commands (`audit`, `update`, `
 
 Desktop app (Tauri) with an interface sidebar, a capture panel with an animated signal line, and a networks table with signal bars and color-coded security badges. The same front-end runs in the browser with `sabia ui`. More in **[docs/interface.md](docs/interface.md)**.
 
+<p align="center"><img src="docs/img/networks-dark-en.png" width="640" alt="The networks table in the dark theme"> <img src="docs/img/attack-dark-en.png" width="640" alt="Network detail dialog showing attacks and authorization"></p>
+
 - Pick the interface, toggle **monitor mode** and start/stop **capture** by button.
 - Live **networks seen** table, with signal, channel and security.
 - An **authorized-use** notice always in view and automatic privilege elevation on startup.