feat(ui): booking redesign + auto-assign settings + specialist fields

Dynamic 3/4-step wizard (omits specialist step when auto-assign on), always-visible MonthCalendar, 2-column desktop layout with morning/afternoon slot grouping, confirmation reasons badges. Settings: auto-assign checkbox + business working-hours editor. Employee modal: specialties, efficiency, per-employee working hours. Fix icon/placeholder overlap app-wide via @layer components + pl-10.

src/index.css

@@ -258,24 +258,26 @@ body {
   background: #fecaca;
 }
 
-.input,
-.select,
-.textarea {
-  width: 100%;
-  background: #ffffff;
-  border: 1px solid #e5e7eb;
-  border-radius: 0.65rem;
-  padding: 0.55rem 0.75rem;
-  font-size: 0.875rem;
-  color: #0f172a;
-  transition: border-color 0.15s, box-shadow 0.15s;
-  outline: none;
-}
-.input:focus,
-.select:focus,
-.textarea:focus {
-  border-color: #3b66ff;
-  box-shadow: 0 0 0 3px rgba(59, 102, 255, 0.15);
+@layer components {
+  .input,
+  .select,
+  .textarea {
+    width: 100%;
+    background: #ffffff;
+    border: 1px solid #e5e7eb;
+    border-radius: 0.65rem;
+    padding: 0.55rem 0.75rem;
+    font-size: 0.875rem;
+    color: #0f172a;
+    transition: border-color 0.15s, box-shadow 0.15s;
+    outline: none;
+  }
+  .input:focus,
+  .select:focus,
+  .textarea:focus {
+    border-color: #3b66ff;
+    box-shadow: 0 0 0 3px rgba(59, 102, 255, 0.15);
+  }
 }
 .label {
   display: block;