feat: add voice mode support via mic passthrough to container

Enables Claude Code's /voice command inside Docker containers by
capturing microphone audio in the Tauri webview and streaming it
into the container via a FIFO pipe.

Container: fake rec/arecord shims read PCM from a FIFO instead of
a real mic. Audio bridge exec writes PCM from Tauri into the FIFO.
Frontend: getUserMedia() + AudioWorklet captures 16kHz mono PCM
and streams it to the container via invoke("send_audio_data").
UI: "Mic Off/On" toggle button in the terminal view.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/src-tauri/src/docker/exec.rs

@@ -60,6 +60,22 @@ impl ExecSessionManager {
         on_output: F,
         on_exit: Box<dyn FnOnce() + Send>,
     ) -> Result<(), String>
+    where
+        F: Fn(Vec<u8>) + Send + 'static,
+    {
+        self.create_session_with_tty(container_id, session_id, cmd, true, on_output, on_exit)
+            .await
+    }
+
+    pub async fn create_session_with_tty<F>(
+        &self,
+        container_id: &str,
+        session_id: &str,
+        cmd: Vec<String>,
+        tty: bool,
+        on_output: F,
+        on_exit: Box<dyn FnOnce() + Send>,
+    ) -> Result<(), String>
     where
         F: Fn(Vec<u8>) + Send + 'static,
     {
@@ -72,7 +88,7 @@ impl ExecSessionManager {
                     attach_stdin: Some(true),
                     attach_stdout: Some(true),
                     attach_stderr: Some(true),
-                    tty: Some(true),
+                    tty: Some(tty),
                     cmd: Some(cmd),
                     user: Some("claude".to_string()),
                     working_dir: Some("/workspace".to_string()),