feat: accept clipboard images — paste screenshot → vision request

server.js

@@ -51,7 +51,7 @@ const SYSTEM_PROMPT = [
     "Respond with the answer only. Nothing else.",
 ].join("\n");
 
-async function callClaude(modelId, text, accessToken) {
+async function callClaude(modelId, content, accessToken) {
     return fetch('https://api.anthropic.com/v1/messages', {
         method: 'POST',
         dispatcher: anthropicAgent,
@@ -68,14 +68,25 @@ async function callClaude(modelId, text, accessToken) {
             max_tokens: 8192,
             stream: true,
             system: SYSTEM_PROMPT,
-            messages: [{ role: 'user', content: text }],
+            messages: [{ role: 'user', content }],
         }),
     });
 }
 
-app.post('/api/chat', express.json({ limit: '10mb' }), async (req, res) => {
-    const { text, model = 'sonnet' } = req.body;
-    if (!text?.trim()) return res.status(400).json({ error: 'text required' });
+app.post('/api/chat', express.json({ limit: '25mb' }), async (req, res) => {
+    const { text, model = 'sonnet', image } = req.body;
+    const hasText = text?.trim();
+    if (!hasText && !image) return res.status(400).json({ error: 'text or image required' });
+
+    let content;
+    if (image?.data && image?.media_type) {
+        content = [
+            { type: 'image', source: { type: 'base64', media_type: image.media_type, data: image.data } },
+            { type: 'text', text: hasText || 'Analyze the image and answer any questions shown in it.' },
+        ];
+    } else {
+        content = text;
+    }
 
     const accessToken = getAccessToken();
     if (!accessToken) {
@@ -92,9 +103,9 @@ app.post('/api/chat', express.json({ limit: '10mb' }), async (req, res) => {
     const fallbackId = MODELS.haiku;
 
     try {
-        let apiResp = await callClaude(primaryId, text, accessToken);
+        let apiResp = await callClaude(primaryId, content, accessToken);
         if (apiResp.status === 429 && primaryId !== fallbackId) {
-            apiResp = await callClaude(fallbackId, text, accessToken);
+            apiResp = await callClaude(fallbackId, content, accessToken);
         }
         if (!apiResp.ok) {
             const errText = await apiResp.text();