feat: Agent Orchestrator — multi-project agent dashboard

Tauri + Svelte 5 + Rust application for orchestrating multiple AI coding agents.
Includes Claude, Aider, Codex, and Ollama provider support, multi-agent
communication (btmsg/bttask), session anchors, plugin sandbox, FTS5 search,
Landlock sandboxing, and 507 vitest + 110 cargo tests.

src/app.css

@@ -0,0 +1,44 @@
+@import './lib/styles/catppuccin.css';
+
+*,
+*::before,
+*::after {
+  box-sizing: border-box;
+  margin: 0;
+  padding: 0;
+}
+
+html, body {
+  height: 100%;
+  width: 100%;
+  overflow: hidden;
+  background: var(--bg-primary);
+  color: var(--text-primary);
+  font-family: var(--ui-font-family);
+  font-size: var(--ui-font-size);
+  line-height: 1.4;
+  -webkit-font-smoothing: antialiased;
+}
+
+#app {
+  height: 100%;
+  width: 100%;
+}
+
+::-webkit-scrollbar {
+  width: 6px;
+  height: 6px;
+}
+
+::-webkit-scrollbar-track {
+  background: var(--bg-secondary);
+}
+
+::-webkit-scrollbar-thumb {
+  background: var(--ctp-surface2);
+  border-radius: 3px;
+}
+
+::-webkit-scrollbar-thumb:hover {
+  background: var(--ctp-overlay0);
+}