Add PAGE word, fix web REPL init code, update deps

Implement PAGE (Facility word set) as IR primitive emitting form feed.
Web REPL clears output div on form feed, CLI REPL sends ANSI clear.
Fix init code panel: use default textarea content instead of placeholder
so init code actually executes on first visit. Update wasm-pack 0.10→0.14
and refresh Cargo.lock to latest compatible versions.

crates/web/www/app.js

@@ -66,7 +66,12 @@ function evaluate(line) {
   historyIdx = history.length;
 
   try {
-    const result = repl.evaluate(trimmed);
+    let result = repl.evaluate(trimmed);
+    // PAGE (form feed) clears the screen
+    if (result.includes('\x0C')) {
+      output.innerHTML = '';
+      result = result.replaceAll('\x0C', '');
+    }
     // Show input + output on one line (traditional Forth style)
     const combined = result.length > 0 ? `${trimmed} ${result} ok` : `${trimmed}  ok`;
     appendLine(combined, 'line-ok');
@@ -230,11 +235,15 @@ async function boot() {
 
     // Restore and run init code
     const saved = localStorage.getItem('wafer-init-code');
-    if (saved) {
+    if (saved !== null) {
       document.getElementById('init-code').value = saved;
-      for (const line of saved.split('\n')) {
+    }
+    const initCode = document.getElementById('init-code').value;
+    if (initCode.trim()) {
+      for (const line of initCode.split('\n')) {
         if (line.trim()) evaluate(line);
       }
+      localStorage.setItem('wafer-init-code', initCode);
     }
 
     // Load from URL hash if present