Add proxy config passthrough to signal-cli (#178)

Adds a `proxy` field to config.toml that gets passed through as
`--proxy <url>` when spawning signal-cli. Useful for connecting
through Signal TLS proxies in censored regions.

Closes #165.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: johnsideserf

src/config.rs

@@ -83,6 +83,10 @@ pub struct Config {
     /// Keybinding profile name (matches a built-in or custom profile)
     #[serde(default = "default_keybinding_profile")]
     pub keybinding_profile: String,
+
+    /// Signal TLS proxy URL passed through to signal-cli (e.g., "https://signal-proxy.example.com")
+    #[serde(default)]
+    pub proxy: String,
 }
 
 fn default_true() -> bool {
@@ -138,6 +142,7 @@ impl Default for Config {
             sidebar_on_right: false,
             theme: default_theme(),
             keybinding_profile: default_keybinding_profile(),
+            proxy: String::new(),
         }
     }
 }

src/signal/client.rs

@@ -33,6 +33,9 @@ impl SignalClient {
         if !config.account.is_empty() {
             cmd.arg("-a").arg(&config.account);
         }
+        if !config.proxy.is_empty() {
+            cmd.arg("--proxy").arg(&config.proxy);
+        }
         cmd.arg("jsonRpc");
         cmd.stdin(std::process::Stdio::piped())
             .stdout(std::process::Stdio::piped())