feat: show unique messaging notifications per contact (#1381)

* Show unique notifications per contact

Instead of a single notification for all messages, each contact now has its own, unique notification. This uses the `NotificationCompat.MessagingStyle` and the contact's name to create distinct notifications, enhancing message organization.

* feat: Add notification tap action to open contacts tab

This is done by:
- Adding an intent extra to the notification with the contact key for future use to navigate to the message thread.
- Adding a new action to the MainActivity to handle the intent.
- Updating the message notification to include the intent.

* Open message notification to the correct conversation

Adds an extra to the message notification intent to open the correct conversation. This ensures that when a user taps on a message notification, they are taken to the conversation with the sender of that message.

app/src/main/java/com/geeksville/mesh/MainActivity.kt

@@ -270,6 +270,14 @@ class MainActivity : AppCompatActivity(), Logging {
                 // We now wait for the device to connect, once connected, we ask the user if they want to switch to the new channel
             }
 
+            MeshServiceNotifications.OPEN_MESSAGE_ACTION -> {
+                val contactKey =
+                    intent.getStringExtra(MeshServiceNotifications.OPEN_MESSAGE_EXTRA_CONTACT_KEY)
+                val contactName =
+                    intent.getStringExtra(MeshServiceNotifications.OPEN_MESSAGE_EXTRA_CONTACT_NAME)
+                showMessages(contactKey, contactName)
+            }
+
             UsbManager.ACTION_USB_DEVICE_ATTACHED -> {
                 showSettingsPage()
             }
@@ -599,6 +607,13 @@ class MainActivity : AppCompatActivity(), Logging {
         binding.pager.currentItem = 5
     }
 
+    private fun showMessages(contactKey: String?, contactName: String?) {
+        model.setCurrentTab(0)
+        if (contactKey != null && contactName != null) {
+            supportFragmentManager.navigateToMessages(contactKey, contactName)
+        }
+    }
+
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
         // Inflate the menu; this adds items to the action bar if it is present.
         menuInflater.inflate(R.menu.menu_main, menu)