feat: implement rule engine, worker pool, event bus, and readability scraping with enhanced logging and content sanitization.

web/src/index.css

@@ -560,8 +560,8 @@ html, body, #root {
 .reader-toolbar {
   position: sticky;
   top: 0;
-  height: 44px;
-  min-height: 44px;
+  height: 46px;
+  min-height: 46px;
   background: rgba(255, 255, 255, 0.95);
   backdrop-filter: blur(8px);
   border-bottom: 1px solid var(--border);
@@ -572,6 +572,107 @@ html, body, #root {
   z-index: 10;
 }
 
+/* Sliding Ball Capsule Toggle Switch */
+.capsule-switch-btn {
+  display: inline-flex;
+  align-items: center;
+  border: none;
+  background: transparent;
+  padding: 0;
+  cursor: pointer;
+  outline: none;
+  user-select: none;
+  margin-left: 0.5rem;
+}
+
+.capsule-switch-track {
+  position: relative;
+  display: flex;
+  align-items: center;
+  width: 86px;
+  height: 26px;
+  border-radius: 9999px;
+  background-color: var(--bg-card-hover);
+  border: 1px solid var(--border-dark);
+  padding: 2px;
+  transition: background-color 0.25s cubic-bezier(0.4, 0, 0.2, 1),
+              border-color 0.25s cubic-bezier(0.4, 0, 0.2, 1),
+              box-shadow 0.25s ease;
+  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.05);
+}
+
+.capsule-switch-btn:hover .capsule-switch-track {
+  border-color: var(--border-focus);
+}
+
+.capsule-switch-btn.active .capsule-switch-track {
+  background-color: #0284c7;
+  border-color: #0284c7;
+}
+
+.capsule-switch-btn.scraping .capsule-switch-track {
+  background-color: #0369a1;
+  border-color: #0369a1;
+  cursor: wait;
+}
+
+.capsule-switch-thumb {
+  position: absolute;
+  top: 2px;
+  left: 2px;
+  width: 20px;
+  height: 20px;
+  border-radius: 50%;
+  background-color: #ffffff;
+  color: #64748b;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15), 0 1px 2px rgba(0, 0, 0, 0.1);
+  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1),
+              color 0.25s ease;
+  z-index: 2;
+}
+
+.capsule-switch-btn.active .capsule-switch-thumb {
+  transform: translateX(60px);
+  color: #0284c7;
+}
+
+.capsule-switch-label {
+  width: 100%;
+  font-size: 0.69rem;
+  font-weight: 600;
+  text-align: center;
+  transition: color 0.25s ease, padding 0.25s ease;
+  z-index: 1;
+  white-space: nowrap;
+  letter-spacing: -0.01em;
+}
+
+/* When thumb is on the left, label is padded to the right */
+.capsule-switch-btn:not(.active) .capsule-switch-label {
+  padding-left: 17px;
+  padding-right: 2px;
+  color: var(--text-main);
+}
+
+/* When thumb is on the right, label is padded to the left */
+.capsule-switch-btn.active .capsule-switch-label {
+  padding-right: 17px;
+  padding-left: 2px;
+  color: #ffffff;
+}
+
+@keyframes spin {
+  from { transform: rotate(0deg); }
+  to { transform: rotate(360deg); }
+}
+
+.spin {
+  animation: spin 1s linear infinite;
+}
+
 .reader-content-canvas {
   max-width: 680px;
   width: 100%;