[Enhancement] Record and display errors related to downloading (#610)

* Added last_error to media item table

* Error messages are now persisted to the last_error field

* Minor layout updates

* Added help tooltip to source content view

* Added error information to homepage tables

* Remove unneeded index

* Added docs to tooltip component

lib/pinchflat_web/controllers/media_profiles/media_profile_html/show.html.heex

@@ -25,8 +25,10 @@
 
       <:tab title="Media Profile" id="media-profile">
         <div class="flex flex-col gap-10 text-white">
-          <h3 class="font-bold text-xl mt-6">Raw Attributes</h3>
-          <.list_items_from_map map={Map.from_struct(@media_profile)} />
+          <section>
+            <h3 class="font-bold text-xl mt-6 mb-2">Raw Attributes</h3>
+            <.list_items_from_map map={Map.from_struct(@media_profile)} />
+          </section>
         </div>
       </:tab>
       <:tab title="Sources" id="sources">