Add README, plugin citations, and multi-platform release CI.

Ship screenshots and third-party notices for the desktop shell, and
package Windows, macOS, deb, rpm, and Flatpak from GitHub Releases.

Co-authored-by: Cursor <cursoragent@cursor.com>

ui/inject/ingest.js

@@ -0,0 +1,45 @@
+(function () {
+  const IMAGE_PATH = /^(?:file:\/\/|(?:\/|\.{1,2}\/)).+\.(?:png|jpe?g|gif|webp|bmp|tiff?)$/i;
+  function looksLikeImagePath(text) {
+    const first = (text || "").trim().split(/\s+/, 1)[0] || "";
+    return IMAGE_PATH.test(first);
+  }
+  document.addEventListener("paste", function (e) {
+    try {
+      const items = Array.from(e.clipboardData ? e.clipboardData.items : []);
+      const files = items.filter(function (item) { return item.kind === "file"; })
+        .map(function (item) { return item.getAsFile(); })
+        .filter(Boolean);
+      if (files.length > 0) return;
+      const text = e.clipboardData ? (e.clipboardData.getData("text/plain") || "") : "";
+      const uris = e.clipboardData ? (e.clipboardData.getData("text/uri-list") || "") : "";
+      if (looksLikeImagePath(text) || looksLikeImagePath(uris)) {
+        e.preventDefault();
+        e.stopImmediatePropagation();
+      }
+    } catch (err) {}
+  }, true);
+
+  window.__dshDesktopPasteFiles = function (items) {
+    try {
+      const dt = new DataTransfer();
+      for (const item of items) {
+        const bin = atob(item.b64);
+        const bytes = new Uint8Array(bin.length);
+        for (let i = 0; i < bin.length; i++) bytes[i] = bin.charCodeAt(i);
+        dt.items.add(new File([bytes], item.name, { type: item.type }));
+      }
+      const drop = new DragEvent("drop", {
+        bubbles: true,
+        cancelable: true,
+        dataTransfer: dt
+      });
+      try {
+        Object.defineProperty(drop, "dataTransfer", { value: dt, configurable: true });
+      } catch (e) {}
+      document.dispatchEvent(drop);
+    } catch (err) {
+      console.error("dsh-desktop paste image failed", err);
+    }
+  };
+})();