[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/sources/source_html/show.html.heex

@@ -24,16 +24,18 @@
       </:tab_append>
 
       <:tab title="Source" id="source">
-        <div class="flex flex-col gap-10 text-white">
-          <h3 class="font-bold text-xl mt-6">Raw Attributes</h3>
+        <div class="flex flex-col text-white gap-10">
           <section>
-            <strong>Media Profile:</strong>
-            <.subtle_link href={~p"/media_profiles/#{@source.media_profile_id}"}>
-              {@source.media_profile.name}
-            </.subtle_link>
-          </section>
+            <h3 class="font-bold text-xl mb-2 mt-6">Raw Attributes</h3>
+            <section>
+              <strong>Media Profile:</strong>
+              <.subtle_link href={~p"/media_profiles/#{@source.media_profile_id}"}>
+                {@source.media_profile.name}
+              </.subtle_link>
+            </section>
 
-          <.list_items_from_map map={Map.from_struct(@source)} />
+            <.list_items_from_map map={Map.from_struct(@source)} />
+          </section>
         </div>
       </:tab>
       <:tab title="Pending" id="pending">