fix: bypass proxy for embedded localhost UI

[Yashh56]

Fixes an issue where the desktop app fails to load its UI and shows a "Message Corrupt" or "Connection to SOCKSv5 server lost" error when an http_proxy environment variable or VPN is active.

Root Cause:
Tauri's underlying webview inherits system proxy settings. When a proxy is active, the webview attempts to route the request to http://localhost:<port> (used by tauri-plugin-localhost) through the remote proxy. The proxy drops the connection because it cannot resolve the client's localhost.

Solution:
Dynamically inject localhost and 127.0.0.1 into the NO_PROXY and no_proxy environment variables at the start of the run() function in src-tauri/src/lib.rs. This instructs the webview to bypass the proxy specifically when loading local UI assets, while ensuring all actual outbound traffic (e.g., Matrix API requests) continues to route securely through the proxy.

Testing:

• Verified the app compiles successfully.
• Tested running the app with an active http_proxy and confirmed the UI loads normally without errors.

closes : #560 #561