Add pomodoro, microbreaks, breathing guide, screen dimming, presentation mode, goals, multi-monitor, and activity manager

src/lib/components/DimOverlay.svelte

@@ -0,0 +1,23 @@
+<script lang="ts">
+  import { onMount } from "svelte";
+  import { listen } from "@tauri-apps/api/event";
+
+  let opacity = $state(0);
+
+  onMount(async () => {
+    await listen<{ progress: number; maxOpacity: number }>("screen-dim-update", (event) => {
+      opacity = event.payload.progress * event.payload.maxOpacity;
+    });
+
+    // When break starts, this window gets destroyed by backend
+    await listen("break-started", () => {
+      opacity = 0;
+    });
+  });
+</script>
+
+<div
+  class="fixed inset-0 pointer-events-none"
+  style="background: rgba(0, 0, 0, {opacity}); transition: opacity 1s linear;"
+  aria-hidden="true"
+></div>