feat(ui): polish DB public access, backups, and nav

Gate public TCP proxy until a port is set, show loading while saving
access, and open proxy logs in process-dialog. Compact backup
execution actions, add Postgres general section anchors, and tint
resource Actions icons with warning color.

resources/css/app.css

@@ -2441,7 +2441,9 @@ input[type="search"]::-webkit-search-results-decoration {
 }
 
 .backup-executions-table-grid {
-    grid-template-columns: 7.5rem minmax(9rem, 1fr) 8rem 6rem 5rem minmax(9rem, 1fr) minmax(9rem, auto);
+    grid-template-columns: 6.5rem minmax(7rem, 1fr) 7rem 5rem 4rem minmax(8rem, 1fr) 5rem;
+    gap: 0.75rem;
+    min-width: 49rem;
 }
 
 .volume-backup-executions-grid {