fix: final review polish before documentation

- Handle base64 encoding from Upstash GETRANGE (atob fallback)
- Add optimistic credit deduction on pixel placement
- Handle non-ok API responses in placePixel
- Enable WebSocket proxy in Vite dev config
- Remove dead CANVAS_WIDTH/HEIGHT vars from wrangler.json
- Suppress favicon 404 with empty data URI

src/client/components/CanvasRenderer.svelte

@@ -56,6 +56,8 @@
     if (x < 0 || x >= CANVAS_WIDTH || y < 0 || y >= CANVAS_HEIGHT) return;
     if (credits <= 0) return;
 
+    // Optimistic deduction + render
+    onCreditsChange(credits - 1);
     updatePixel(x, y, selectedColor);
     render();
 
@@ -66,7 +68,12 @@
         body: JSON.stringify({ pixels: [{ x, y, color: selectedColor }] }),
       });
       const data = await res.json();
-      if (data.ok) onCreditsChange(data.credits);
+      if (data.ok) {
+        onCreditsChange(data.credits);
+      } else {
+        // Server rejected — log reason (pixel stays rendered, WS will correct)
+        console.warn('Place rejected:', data.error);
+      }
     } catch (err) {
       console.error('Failed to place pixel:', err);
     }

src/index.html

@@ -4,7 +4,7 @@
   <meta charset="UTF-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   <title>rplace — Collaborative Pixel Canvas</title>
-  <link rel="icon" href="/favicon.ico" />
+  <link rel="icon" href="data:," />
 </head>
 <body>
   <div id="app"></div>

src/lib/canvas-storage.js

@@ -21,11 +21,17 @@ export async function getFullCanvas(env) {
     return new Uint8Array(CANVAS_BYTES);
   }
 
-  // Upstash REST returns string — convert to bytes
+  // Upstash REST may return base64 or raw string for binary data
   if (typeof data === 'string') {
-    const bytes = new Uint8Array(data.length);
-    for (let i = 0; i < data.length; i++) {
-      bytes[i] = data.charCodeAt(i);
+    let raw;
+    try {
+      raw = atob(data);
+    } catch {
+      raw = data; // Already a raw string
+    }
+    const bytes = new Uint8Array(raw.length);
+    for (let i = 0; i < raw.length; i++) {
+      bytes[i] = raw.charCodeAt(i);
     }
     // Pad to full canvas size if shorter
     if (bytes.length < CANVAS_BYTES) {