Clean up: Remove component files

frontend/src/components/common/AppShell.css

@@ -1,151 +0,0 @@
-/* AppShell layout: header, team sidebar, main region */
-.app-shell {
-  min-height: 100vh;
-  display: flex;
-  flex-direction: column;
-  background-color: #f8fafc;
-}
-
-/* Header */
-.app-header {
-  background-color: white;
-  border-bottom: 1px solid #e2e8f0;
-  box-shadow: 0 1px 3px 0 rgba(15, 23, 42, 0.06);
-  position: sticky;
-  top: 0;
-  z-index: 10;
-}
-
-.app-header-content {
-  max-width: 1440px;
-  margin: 0 auto;
-  padding: 0.875rem 2rem;
-  display: flex;
-  align-items: center;
-  justify-content: space-between;
-}
-
-.app-logo h1 {
-  font-size: 1.375rem;
-  font-weight: 700;
-  color: #1d4ed8;
-}
-
-.app-header-actions {
-  display: flex;
-  align-items: center;
-  gap: 1rem;
-}
-
-.user-profile {
-  display: flex;
-  align-items: center;
-  gap: 0.625rem;
-}
-
-.user-name {
-  font-weight: 500;
-  color: #334155;
-  font-size: 0.9375rem;
-}
-
-/* Body */
-.app-body {
-  flex: 1;
-  display: flex;
-  max-width: 1440px;
-  margin: 0 auto;
-  width: 100%;
-}
-
-/* Sidebar */
-.app-sidebar {
-  width: 264px;
-  flex: none;
-  background-color: white;
-  border-right: 1px solid #e2e8f0;
-  padding: 1.5rem;
-}
-
-.sidebar-section {
-  margin-bottom: 2rem;
-}
-
-.sidebar-heading {
-  font-size: 0.75rem;
-  font-weight: 600;
-  color: #6b7280;
-  text-transform: uppercase;
-  letter-spacing: 0.05em;
-  margin-bottom: 0.875rem;
-}
-
-.team-list {
-  display: flex;
-  flex-direction: column;
-  gap: 0.25rem;
-  list-style: none;
-}
-
-.team-member {
-  display: flex;
-  align-items: center;
-  gap: 0.625rem;
-  padding: 0.5rem;
-  border-radius: 0.375rem;
-  transition: background-color 0.2s;
-}
-
-.team-member:hover {
-  background-color: #f1f5f9;
-}
-
-.member-name {
-  flex: 1;
-  font-size: 0.875rem;
-  font-weight: 500;
-  color: #334155;
-}
-
-.online-indicator {
-  width: 8px;
-  height: 8px;
-  background-color: #059669;
-  border-radius: 50%;
-  flex: none;
-}
-
-/* Main */
-.app-main {
-  flex: 1;
-  min-width: 0;
-  padding: 1.75rem 2rem;
-}
-
-@media (max-width: 768px) {
-  .app-header-content {
-    padding: 0.75rem 1rem;
-  }
-
-  .app-logo h1 {
-    font-size: 1.25rem;
-  }
-
-  .user-name {
-    display: none;
-  }
-
-  .app-body {
-    flex-direction: column;
-  }
-
-  /* Team list is secondary on small screens; the task list gets the room. */
-  .app-sidebar {
-    display: none;
-  }
-
-  .app-main {
-    padding: 1rem;
-    padding-bottom: 5.5rem; /* clear of the floating Create Task button */
-  }
-}