more cleanup

frontend/src/styles/App.css

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+#root {
+  max-width: 1280px;
+  margin: 0 auto;
+  padding: 2rem;
+  text-align: center;
+}

frontend/src/styles/index.css

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+:root {
+  font-family: system-ui, Avenir, Helvetica, Arial, sans-serif;
+  line-height: 1.5;
+  font-weight: 400;
+  color-scheme: light dark;
+  color: rgba(255, 255, 255, 0.87);
+  background-color: #242424;
+  font-synthesis: none;
+  text-rendering: optimizeLegibility;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+body {
+  margin: 0;
+  min-width: 320px;
+  min-height: 100vh;
+}
+
+h1 {
+  font-size: 3.2em;
+  line-height: 1.1;
+}
+
+button {
+  border-radius: 8px;
+  border: 1px solid transparent;
+  padding: 0.6em 1.2em;
+  font-size: 1em;
+  font-weight: 500;
+  font-family: inherit;
+  background-color: #1a1a1a;
+  cursor: pointer;
+  transition: border-color 0.25s;
+}
+
+button:hover {
+  border-color: #646cff;
+}
+
+button:focus,
+button:focus-visible {
+  outline: 4px auto -webkit-focus-ring-color;
+}
+
+button:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
+@media (prefers-color-scheme: light) {
+  :root {
+    color: #213547;
+    background-color: #ffffff;
+  }
+  button {
+    background-color: #f9f9f9;
+  }
+}

frontend/src/styles/stickies.css

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+.stickies-grid {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 16px;
+  justify-content: center;
+  padding: 24px;
+}
+
+.clusters-container {
+  display: flex;
+  flex-direction: column;
+  gap: 32px;
+  padding: 24px 0;
+}
+
+.cluster-group {
+  border: 1px solid rgba(255, 255, 255, 0.1);
+  border-radius: 8px;
+  padding: 16px;
+}
+
+.cluster-label {
+  margin: 0 0 16px 0;
+  font-size: 1.2em;
+  font-weight: 600;
+}

frontend/src/styles/sticky.css

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+.sticky-note {
+  width: 180px;
+  min-height: 180px;
+  padding: 16px;
+  border-radius: 2px;
+  box-shadow: 2px 4px 8px rgba(0, 0, 0, 0.15);
+  font-family: 'Patrick Hand', cursive, system-ui;
+  font-size: 14px;
+  line-height: 1.4;
+  color: #333;
+  display: flex;
+  align-items: flex-start;
+  word-break: break-word;
+}