feat(helpdesk): add dashboards, communication feed, settings UI and fix routing

Add support/sales/controlling dashboards with KPIs, trend charts and
risk indicators. Add debitor communication timeline, contact filters,
system recommendations engine, and configurable controlling risk rules.

Rename search→index to fix query-string preservation on back navigation.
Remove fake escalation rate metric, add KPI info tooltips, and switch
trend chart colors to red (created) / green (closed) for clarity.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/css/components/app-details.css

@@ -122,14 +122,14 @@
   .app-details-container .app-breadcrumb {
     padding-top: calc(var(--app-spacing) * 2);
     position: sticky;
-    top: 16px;
+    top: 49px;
     z-index: 10;
     background: var(--app-background-color);
   }
 
   .app-details-container .app-details-titlebar {
     position: sticky;
-    top: 64px;
+    top: 93px;
     z-index: 10;
     background: var(--app-background-color);
   }