Add PNG and TIFF support v0.5

app/static/index.html

@@ -16,7 +16,7 @@
         <div class="brand-mark" aria-hidden="true">◫</div>
         <div>
           <h1 id="app-name">Photo Date Editor</h1>
-          <p>Local folder · in-place JPEG metadata</p>
+          <p>Local folder · in-place JPG, PNG and TIFF metadata</p>
         </div>
       </div>
       <div class="top-actions">
@@ -70,10 +70,11 @@
             <select id="sort-select" class="input filter" aria-label="Sort photos" disabled>
               <option value="filename">Sort: Filename</option>
               <option value="status">Sort: Status</option>
+              <option value="format">Sort: Format</option>
             </select>
           </div>
           <div id="file-list" class="file-list" aria-live="polite">
-            <div class="empty-list">Choose a folder containing JPG or JPEG photos.</div>
+            <div class="empty-list">Choose a folder containing JPG, PNG, or TIFF photos.</div>
           </div>
         </section>