style: unify all views on Mission Control V2 design tokens

- Map legacy v1 CSS variables (--nx-*, --panel, --text-*, --surface*) to V2 tokens in nexus-tokens.css
- Restyle global shell (main.css), AppSidebar, AppHeader to match V2 Sidebar/Topbar (glass, gradients, Space Grotesk)
- Add GalaxyBackground to the v1 shell in App.vue
- Replace hardcoded v1 hex colors with V2 tokens in all deviating views (Agents, Calendar, Docs, Incidents, Memory, Notifications, ProjectDetail, Security, Team, TaskDetail, Settings)
- Keep JS status colors as hex where alpha suffixes are concatenated (AgentsIndex, Team, Notifications)
- Add Settings nav item (System group) + gear icon to V2 sidebar so it shows on the dashboard
- No component or layout structure changes; LoginView and TaskBoardView untouched

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/views/CalendarView.vue

@@ -219,7 +219,7 @@ onMounted(() => {
 }
 .calendar-panel {
   border: 1px solid var(--line);
-  border-radius: 9px;
+  border-radius: var(--r);
   background: var(--panel);
   padding: 16px;
 }
@@ -235,7 +235,7 @@ onMounted(() => {
   margin: 0;
   font-size: 13px;
   font-weight: 600;
-  color: #e8eaf0;
+  color: var(--tx);
 }
 .calendar-status {
   display: flex;
@@ -243,11 +243,11 @@ onMounted(() => {
   justify-content: center;
   gap: 8px;
   padding: 32px;
-  color: #7e8799;
+  color: var(--tx-3);
   font-size: 11px;
 }
 .calendar-status.error {
-  color: #e16e75;
+  color: var(--st-block);
 }
 
 /* Upcoming jobs */
@@ -268,25 +268,25 @@ onMounted(() => {
   display: grid;
   place-items: center;
   border-radius: 6px;
-  color: #a99cf5;
+  color: var(--a-mid);
   background: rgba(139,124,246,.1);
 }
 .upcoming-item-info strong {
   display: block;
   font-size: 11px;
   margin-bottom: 2px;
-  color: #e8eaf0;
+  color: var(--tx);
 }
 .upcoming-item-schedule {
   display: block;
   font-size: 9px;
-  color: #7e8799;
+  color: var(--tx-3);
   margin-bottom: 2px;
 }
 .upcoming-item-next {
   display: block;
   font-size: 9px;
-  color: #a99cf5;
+  color: var(--a-mid);
   font-weight: 600;
 }
 
@@ -310,19 +310,19 @@ onMounted(() => {
   border-radius: 6px;
 }
 .job-item-icon.status-completed {
-  color: #27ae60;
+  color: var(--st-work);
   background: rgba(39, 174, 96, 0.12);
 }
 .job-item-icon.status-running {
-  color: #3498db;
+  color: var(--a-blue);
   background: rgba(52, 152, 219, 0.12);
 }
 .job-item-icon.status-failed {
-  color: #e74c3c;
+  color: var(--st-block);
   background: rgba(231, 76, 60, 0.12);
 }
 .job-item-icon.status-idle {
-  color: #7e8799;
+  color: var(--tx-3);
   background: rgba(126, 135, 153, 0.12);
 }
 .job-item-info {
@@ -332,19 +332,19 @@ onMounted(() => {
   display: block;
   font-size: 11px;
   margin-bottom: 2px;
-  color: #e8eaf0;
+  color: var(--tx);
 }
 .job-item-id {
   display: block;
   font-size: 9px;
-  color: #6b7385;
+  color: var(--tx-3);
   margin-bottom: 2px;
   font-family: monospace;
 }
 .job-item-schedule {
   display: block;
   font-size: 9px;
-  color: #7e8799;
+  color: var(--tx-3);
 }
 .job-item-meta {
   display: flex;
@@ -355,7 +355,7 @@ onMounted(() => {
 }
 .job-item-meta small {
   font-size: 8px;
-  color: #6b7385;
+  color: var(--tx-3);
   text-align: right;
 }
 .job-status-badge {
@@ -368,19 +368,19 @@ onMounted(() => {
 }
 .job-status-badge.status-completed {
   background: rgba(39, 174, 96, 0.15);
-  color: #27ae60;
+  color: var(--st-work);
 }
 .job-status-badge.status-running {
   background: rgba(52, 152, 219, 0.15);
-  color: #3498db;
+  color: var(--a-blue);
 }
 .job-status-badge.status-failed {
   background: rgba(231, 76, 60, 0.15);
-  color: #e74c3c;
+  color: var(--st-block);
 }
 .job-status-badge.status-idle {
   background: rgba(126, 135, 153, 0.15);
-  color: #7e8799;
+  color: var(--tx-3);
 }
 .spin {
   animation: spin 1s linear infinite;