Add sidebar navigation and global command search

src/lib/ui/server-health.ts

@@ -8,6 +8,7 @@ export interface ServerHealthPresentation {
     state: ServerHealthState;
     label: string;
     reason: string;
+    shortReason: string;
     actionLabel: string;
     actionHref: string;
     /** Last relevant evidence, not an inferred time when the state began. */
@@ -22,10 +23,21 @@ function observedAt(value: string | null | undefined, now: number): string | nul
 /** Explain the available evidence without treating a missing report as a stopped game. */
 export function serverHealth(server: FleetServer, now: number): ServerHealthPresentation {
     const evidence = healthEvidence(server, now);
-    return { ...evidence, label: statusPresentation(evidence.state).label };
+    const error = decodeRconError(server.last_error);
+    const connectionReason = error ? {
+        'no-config': 'Connection not configured.', 'no-port': 'Connection port not configured.',
+        'send-error': 'Game connection failed.', timeout: 'No reply to the status check.',
+        'bad-reply': 'Unreadable game response.', 'no-players': 'Player count not reported.'
+    }[error.reason] : null;
+    const shortReason = evidence.state === 'host-offline' ? `${server.host?.name ?? 'Host'} unavailable; game may still run.`
+        : evidence.state === 'stopped' ? 'Container confirmed stopped.'
+        : evidence.state === 'not-responding' ? connectionReason ?? 'Game report out of date; players unknown.'
+        : evidence.state === 'unknown' ? connectionReason ?? (freshStatusTimestamp(server.last_seen_at, now) ? 'Game replied; container unverified.' : 'Game and container unverified.')
+        : evidence.reason;
+    return { ...evidence, shortReason, label: statusPresentation(evidence.state).label };
 }
 
-function healthEvidence(server: FleetServer, now: number): Omit<ServerHealthPresentation, 'label'> {
+function healthEvidence(server: FleetServer, now: number): Omit<ServerHealthPresentation, 'label' | 'shortReason'> {
     const href = `/servers/${encodeURIComponent(server.name)}`;
     const diagnostics = `${href}?tab=diagnostics`;
     const host = server.host;