Ely Office: six offline-first desktop apps in Rust and GPUI

ElyDoc, ElyTable, ElyShow (LibreOfficeKit), ElyPDF (MuPDF), ElyTree (Git),
ElyMark (Milkdown and CodeMirror in CEF). ElyMail and ElyAgent follow.

tests/fixtures/web/probe.html

@@ -0,0 +1,32 @@
+<!doctype html>
+<html>
+<head>
+<meta charset="utf-8">
+<style>
+  body { background: var(--ely-bg); color: var(--ely-fg); margin: 0; }
+  textarea { width: 90%; height: 200px; }
+</style>
+</head>
+<body>
+<div id="marker" style="width: 300px; height: 150px; background: rgb(255, 0, 170)"></div>
+<textarea id="text" aria-label="Text"></textarea>
+<script src="../web-outside/evil.js"></script>
+<script>
+  // The probe asks; the page answers through elyQuery.
+  window.report = (step) => window.elyQuery({
+    request: JSON.stringify({
+      step,
+      value: document.getElementById("text").value,
+      focused: document.activeElement && document.activeElement.id,
+      fg: getComputedStyle(document.documentElement).getPropertyValue("--ely-fg").trim(),
+      ratio: window.devicePixelRatio,
+      outside: Boolean(window.outsideRan),
+      rtc: typeof window.RTCPeerConnection,
+    }),
+    onSuccess: () => {},
+    onFailure: (code, message) => console.error("probe query failed", code, message),
+  });
+  document.getElementById("text").focus();
+</script>
+</body>
+</html>