fix(shell): enable allowProposedApi for Unicode11 addon

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Assisted-by: GLM-5.1 via Crush <crush@charm.land>

web/src/components/Shell.jsx

@@ -203,6 +203,7 @@ function createTerminal(container, settings = {}) {
   const theme = getTheme(settings.theme || 'system')
   const term = new XTerm({
     cursorBlink: true,
+    allowProposedApi: true,
     fontSize: settings.fontSize || 12,
     fontFamily: settings.fontFamily || "'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'SF Mono', 'Menlo', monospace",
     theme,