refactor: Flatten directory structure

Move project files from uzdb/ subdirectory to root directory for cleaner project structure.

Changes:
- Move frontend/ to root
- Move internal/ to root
- Move build/ to root
- Move all config files (go.mod, wails.json, etc.) to root
- Remove redundant uzdb/ subdirectory nesting

Project structure is now:
├── frontend/        # React application
├── internal/        # Go backend
├── build/           # Wails build assets
├── doc/             # Design documentation
├── main.go          # Entry point
└── ...

🤖 Generated with Qoder

frontend/src/components/common/StatusIndicator.css

@@ -0,0 +1,73 @@
+/**
+ * StatusIndicator Component Styles
+ */
+
+.status-indicator {
+  width: 8px;
+  height: 8px;
+  border-radius: 50%;
+  display: inline-block;
+  margin-right: var(--space-2);
+  transition: all var(--transition-normal) var(--ease-in-out);
+  flex-shrink: 0;
+}
+
+/* Connected state - Green with glow */
+.status-indicator.status-connected {
+  background-color: var(--success);
+  box-shadow: 0 0 4px var(--success);
+}
+
+/* Active state - Blue with pulse animation */
+.status-indicator.status-active {
+  background-color: var(--primary);
+  box-shadow: 0 0 8px var(--primary);
+  animation: pulse 2s infinite;
+}
+
+/* Disconnected state - Gray with border */
+.status-indicator.status-disconnected {
+  background-color: var(--text-muted);
+  border: 1px solid var(--border);
+}
+
+/* Connecting state - Orange spinning animation */
+.status-indicator.status-connecting {
+  width: 10px;
+  height: 10px;
+  border: 2px solid var(--warning);
+  border-top-color: transparent;
+  animation: spin 1s linear infinite;
+}
+
+/* Error state - Red with help cursor */
+.status-indicator.status-error {
+  background-color: var(--error);
+  cursor: help;
+}
+
+/* Hover effect for clickable indicators */
+.status-indicator[tabindex]:hover {
+  transform: scale(1.2);
+}
+
+.status-indicator[tabindex]:focus-visible {
+  outline: 2px solid var(--primary);
+  outline-offset: 2px;
+}
+
+/* Animations */
+@keyframes pulse {
+  0%, 100% {
+    opacity: 1;
+  }
+  50% {
+    opacity: 0.6;
+  }
+}
+
+@keyframes spin {
+  to {
+    transform: rotate(360deg);
+  }
+}