switch mp3 to tts, add genserver to app supervisor tree that periodically checks for newly connected devices and plays their associated tts message

lib/here_i_am_web/live/device_live/form_component.ex

@@ -20,7 +20,7 @@ defmodule HereIAmWeb.DeviceLive.FormComponent do
         phx-submit="save"
       >
         <.input field={@form[:ip_address]} type="text" label="IP Address" />
-        <.input field={@form[:audio]} type="text" label="Audio" />
+        <.input field={@form[:tts]} type="text" label="tts" />
         <:actions>
           <.button phx-disable-with="Saving...">Save Device</.button>
         </:actions>

lib/here_i_am_web/live/device_live/index.html.heex

@@ -13,7 +13,7 @@
   row_click={fn {_id, device} -> JS.navigate(~p"/devices/#{device}") end}
 >
   <:col :let={{_id, device}} label="IP Address"><%= device.ip_address %></:col>
-  <:col :let={{_id, device}} label="Audio"><%= device.audio %></:col>
+  <:col :let={{_id, device}} label="TTS"><%= device.tts %></:col>
   <:action :let={{_id, device}}>
     <div class="sr-only">
       <.link navigate={~p"/devices/#{device}"}>Show</.link>

lib/here_i_am_web/live/device_live/show.html.heex

@@ -10,7 +10,7 @@
 
 <.list>
   <:item title="IP Address"><%= @device.ip_address %></:item>
-  <:item title="Audio"><%= @device.audio %></:item>
+  <:item title="TTS"><%= @device.tts %></:item>
 </.list>
 
 <.back navigate={~p"/devices"}>Back to devices</.back>