feat(#194): add Speech-to-Text voice dictation support in chat (#413)

* feat(#194): add Speech-to-Text voice dictation support in chat

* fix(#194): resolve android lint warnings and update compose UI test

* fix(#194): remove invalid assertDoesNotExist import

app/src/androidTest/java/com/m57/hermescontrol/ui/chat/ChatScreenTest.kt

@@ -64,10 +64,13 @@ class ChatScreenTest {
             )
         }
 
-        // Verify the send button is displayed
-        composeTestRule.onNodeWithTag("send_button").assertIsDisplayed()
+        // Verify the mic button is displayed initially and send button is not
+        composeTestRule.onNodeWithTag("mic_button").assertIsDisplayed()
+        composeTestRule.onNodeWithTag("send_button").assertDoesNotExist()
 
-        // Verify the input field accepts text
+        // Verify entering text switches mic button to send button
         composeTestRule.onNodeWithTag("chat_input").performTextInput("Hello Hermes")
+        composeTestRule.onNodeWithTag("send_button").assertIsDisplayed()
+        composeTestRule.onNodeWithTag("mic_button").assertDoesNotExist()
     }
 }