Initial commit - Core Cooldown v0.1.0

Portable Windows break timer to prevent RSI and eye strain.
Tauri v2 + Svelte 5 + Tailwind CSS v4. No installer, no telemetry,
no data leaves the machine. CC0 public domain.

src/app.css

@@ -0,0 +1,57 @@
+@import "tailwindcss";
+
+@theme {
+  --color-bg: #000000;
+  --color-surface: #0e0e0e;
+  --color-card: #141414;
+  --color-card-lt: #1c1c1c;
+  --color-border: #222222;
+  --color-accent: #ff4d00;
+  --color-accent-lt: #ff7733;
+  --color-accent-dim: #ff4d0018;
+  --color-accent-glow: #ff4d0040;
+  --color-success: #3fb950;
+  --color-warning: #f0a500;
+  --color-danger: #f85149;
+  --color-text-pri: #ffffff;
+  --color-text-sec: #777777;
+  --color-text-dim: #3a3a3a;
+  --color-caption-bg: #050505;
+}
+
+html,
+body {
+  margin: 0;
+  padding: 0;
+  background: #000000;
+  color: var(--color-text-pri);
+  font-family:
+    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
+    Arial, sans-serif;
+  overflow: hidden;
+  height: 100%;
+  user-select: none;
+  -webkit-user-select: none;
+}
+
+#app {
+  height: 100%;
+}
+
+/* Scrollbar */
+::-webkit-scrollbar {
+  width: 5px;
+}
+
+::-webkit-scrollbar-track {
+  background: transparent;
+}
+
+::-webkit-scrollbar-thumb {
+  background: #222;
+  border-radius: 3px;
+}
+
+::-webkit-scrollbar-thumb:hover {
+  background: #333;
+}