Replace track count with source in results table

Changed table columns from Title | Duration | Tracks
to Title | Source | Duration - more useful to see where
the MIDI is from (BitMidi, etc.) than track count.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

index.html

@@ -183,8 +183,12 @@
             text-transform: uppercase;
         }
 
-        .results-table .duration-col,
-        .results-table .tracks-col {
+        .results-table .source-col {
+            width: 100px;
+            text-align: center;
+        }
+
+        .results-table .duration-col {
             width: 80px;
             text-align: center;
         }
@@ -222,7 +226,7 @@
                 font-size: 11px;
             }
 
-            .results-table .tracks-col {
+            .results-table .source-col {
                 display: none;
             }
 
@@ -627,8 +631,8 @@
                 <thead>
                     <tr>
                         <th>Title</th>
+                        <th class="source-col">Source</th>
                         <th class="duration-col">Duration</th>
-                        <th class="tracks-col">Tracks</th>
                     </tr>
                 </thead>
                 <tbody id="resultsBody">

src/main.ts

@@ -190,8 +190,8 @@ class MotifApp {
 
       row.innerHTML = `
         <td>${result.title}</td>
+        <td class="source-col">${result.source}</td>
         <td class="duration-col">${result.parsed ? Math.round(result.parsed.durationSec) + 's' : '?'}</td>
-        <td class="tracks-col">${result.parsed ? result.parsed.tracks.length : '?'}</td>
       `;
 
       // Make entire row clickable