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/styles.css

@@ -0,0 +1,114 @@
+:root {
+  color-scheme: light dark;
+  --bg: #f5f5f7;
+  --text: #1d1d1f;
+  --muted: #86868b;
+  --accent: #0071e3;
+  --card: rgba(255, 255, 255, 0.64);
+}
+
+@media (prefers-color-scheme: dark) {
+  :root {
+    --bg: #000000;
+    --text: #f5f5f7;
+    --muted: #86868b;
+    --accent: #0a84ff;
+    --card: rgba(28, 28, 30, 0.72);
+  }
+}
+
+* { box-sizing: border-box; }
+
+html, body {
+  margin: 0;
+  min-height: 100%;
+  background: var(--bg);
+  color: var(--text);
+  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
+    "Helvetica Neue", system-ui, sans-serif;
+  -webkit-font-smoothing: antialiased;
+}
+
+body {
+  min-height: 100vh;
+}
+
+.stage {
+  min-height: 100vh;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 72px 32px 48px;
+}
+
+.hero {
+  width: min(420px, 100%);
+  text-align: center;
+}
+
+.mark {
+  display: block;
+  width: 72px;
+  height: 72px;
+  margin: 0 auto 22px;
+  border-radius: 18px;
+  object-fit: contain;
+}
+
+h1 {
+  margin: 0;
+  font-size: 28px;
+  font-weight: 600;
+  letter-spacing: -0.03em;
+}
+
+#status {
+  margin: 10px 0 0;
+  color: var(--muted);
+  font-size: 13px;
+  line-height: 1.5;
+  min-height: 1.5em;
+}
+
+.ring {
+  width: 22px;
+  height: 22px;
+  margin: 28px auto 0;
+  border-radius: 50%;
+  border: 1.5px solid rgba(134, 134, 139, 0.28);
+  border-top-color: var(--text);
+  animation: spin 0.8s linear infinite;
+}
+
+.ring[hidden] { display: none; }
+
+@keyframes spin { to { transform: rotate(360deg); } }
+
+.pill {
+  margin-top: 28px;
+  appearance: none;
+  border: 0;
+  border-radius: 980px;
+  background: var(--accent);
+  color: #fff;
+  font: 600 13px/1 -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
+  padding: 9px 18px;
+  cursor: default;
+}
+
+.pill[hidden] { display: none; }
+
+#detail {
+  margin: 22px 0 0;
+  text-align: left;
+  max-height: 180px;
+  overflow: auto;
+  padding: 12px 14px;
+  border-radius: 12px;
+  background: var(--card);
+  color: var(--muted);
+  font: 11px/1.45 ui-monospace, SFMono-Regular, Menlo, monospace;
+  white-space: pre-wrap;
+}
+
+#detail[hidden] { display: none; }