feat(messages): paste images into chat + responsive image display

- Paste handler: Ctrl+V image → uploads to /api/messages/upload-image → inserts <img>
- Fallback to base64 if upload fails
- Enter sends messages with images (even without text)
- CSS: responsive images in messages (max 300px height, rounded)
- CSS: images in Quill editor resizable

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

static/js/conversations.js

@@ -1244,9 +1244,10 @@
                                 handler: function() {
                                     var html = state.quill.root.innerHTML;
                                     var text = state.quill.getText().trim();
-                                    if (text) {
+                                    var hasContent = text || html.indexOf('<img') !== -1;
+                                    if (hasContent) {
                                         state.quill.setText('');
-                                        Composer.sendContent(html, text);
+                                        Composer.sendContent(html, text || '(obraz)');
                                     }
                                     return false;
                                 }
@@ -1266,6 +1267,44 @@
                 },
             });
 
+            // Handle pasted images — upload to server and insert as <img>
+            state.quill.root.addEventListener('paste', function(e) {
+                var clipboardData = e.clipboardData || window.clipboardData;
+                if (!clipboardData || !clipboardData.items) return;
+                for (var i = 0; i < clipboardData.items.length; i++) {
+                    var item = clipboardData.items[i];
+                    if (item.type.indexOf('image') !== -1) {
+                        e.preventDefault();
+                        e.stopPropagation();
+                        var file = item.getAsFile();
+                        if (file) {
+                            // Upload image as attachment
+                            var fd = new FormData();
+                            fd.append('image', file, 'pasted-image.png');
+                            api('/api/messages/upload-image', 'POST', fd)
+                                .then(function(result) {
+                                    if (result && result.url) {
+                                        var range = state.quill.getSelection(true);
+                                        state.quill.insertEmbed(range.index, 'image', result.url);
+                                        state.quill.setSelection(range.index + 1);
+                                    }
+                                })
+                                .catch(function(err) {
+                                    // Fallback: insert as base64
+                                    var reader = new FileReader();
+                                    reader.onload = function(ev) {
+                                        var range = state.quill.getSelection(true);
+                                        state.quill.insertEmbed(range.index, 'image', ev.target.result);
+                                        state.quill.setSelection(range.index + 1);
+                                    };
+                                    reader.readAsDataURL(file);
+                                });
+                        }
+                        return;
+                    }
+                }
+            });
+
             // Typing indicator
             state.quill.on('text-change', function () {
                 Composer.sendTyping();

templates/messages/conversations.html

@@ -10,6 +10,23 @@
 <style>
   footer { display: none !important; }
   main { padding-bottom: 0 !important; margin-bottom: 0 !important; }
+  /* Images in messages — responsive with max size */
+  .message-content img {
+      max-width: 100%;
+      max-height: 300px;
+      border-radius: 8px;
+      cursor: pointer;
+      object-fit: contain;
+  }
+  .message-content img:hover { opacity: 0.9; }
+  /* Images in Quill editor — resizable */
+  .ql-editor img {
+      max-width: 100%;
+      max-height: 200px;
+      border-radius: 4px;
+      resize: both;
+      overflow: hidden;
+  }
   /* Hide floating buttons that overlap with chat input area */
   .pwa-smart-banner, .staging-panel-toggle { display: none !important; }
 </style>