feat: capture mobile evidence bundles (Closes #823)

frontend/index.html

@@ -754,15 +754,15 @@
         <button id="file-new-issue" type="button">File now</button>
       </div>
       <section class="create-issue-attachment" aria-labelledby="create-issue-attachment-label">
-        <strong id="create-issue-attachment-label">Screenshot <span class="small">Optional · PNG, JPEG, or WebP · 2 MB max</span></strong>
+        <strong id="create-issue-attachment-label">Evidence screenshots <span class="small">Optional · Up to 5 · PNG, JPEG, or WebP · 2 MB each</span></strong>
         <div class="issue-attachment-controls">
-          <label class="issue-attachment-trigger" for="create-issue-attachment">Attach screenshot</label>
-          <input class="visually-hidden" id="create-issue-attachment" type="file" accept="image/png,image/jpeg,image/webp" />
+          <label class="issue-attachment-trigger" for="create-issue-attachment">Add screenshots</label>
+          <input class="visually-hidden" id="create-issue-attachment" type="file" accept="image/png,image/jpeg,image/webp" multiple />
         </div>
         <div class="issue-attachment-preview" id="create-issue-attachment-preview" hidden>
           <img id="create-issue-attachment-image" alt="Selected screenshot preview" />
           <span class="small" id="create-issue-attachment-meta"></span>
-          <button id="remove-create-issue-attachment" type="button">Remove</button>
+          <button id="remove-create-issue-attachment" type="button">Remove latest</button>
         </div>
         <div class="small" id="create-issue-attachment-status" aria-live="polite"></div>
       </section>