webui: extend cached props fallback to offline errors

Treat connection failures (refused, DNS, timeout, fetch) the same way as
server 5xx so the warning banner shows up when cache is available, instead
of falling back to a full error screen.

Author: ServeurpersoCom

tools/server/webui/src/lib/stores/server.svelte.ts

@@ -182,38 +182,45 @@ class ServerStore {
 		} catch (error) {
 			const hadCachedProps = this._serverProps !== null;
 			let errorMessage = 'Failed to connect to server';
+			let isOfflineLikeError = false;
+			let isServerSideError = false;
 
 			if (error instanceof Error) {
 				// Handle specific error types with user-friendly messages
 				if (error.name === 'TypeError' && error.message.includes('fetch')) {
 					errorMessage = 'Server is not running or unreachable';
+					isOfflineLikeError = true;
 				} else if (error.message.includes('ECONNREFUSED')) {
 					errorMessage = 'Connection refused - server may be offline';
+					isOfflineLikeError = true;
 				} else if (error.message.includes('ENOTFOUND')) {
 					errorMessage = 'Server not found - check server address';
+					isOfflineLikeError = true;
 				} else if (error.message.includes('ETIMEDOUT')) {
 					errorMessage = 'Connection timeout - server may be overloaded';
+					isOfflineLikeError = true;
 				} else if (error.message.includes('503')) {
 					errorMessage = 'Server temporarily unavailable - try again shortly';
+					isServerSideError = true;
 				} else if (error.message.includes('500')) {
 					errorMessage = 'Server error - check server logs';
+					isServerSideError = true;
 				} else if (error.message.includes('404')) {
 					errorMessage = 'Server endpoint not found';
 				} else if (error.message.includes('403') || error.message.includes('401')) {
 					errorMessage = 'Access denied';
 				}
 			}
 
-			const is500Error = error instanceof Error && error.message.includes('500');
+			let cachedProps: ApiLlamaCppServerProps | null = null;
 
 			if (!hadCachedProps) {
-				const cachedProps = this.readCachedServerProps();
+				cachedProps = this.readCachedServerProps();
 				if (cachedProps) {
 					this._serverProps = cachedProps;
 					this._error = null;
 
-					// For 500 errors with cached props, show as warning instead of error
-					if (is500Error) {
+					if (isOfflineLikeError || isServerSideError) {
 						this._serverWarning = errorMessage;
 					}
 
@@ -227,8 +234,7 @@ class ServerStore {
 			} else {
 				this._error = null;
 
-				// For 500 errors with cached props, show as warning instead of error
-				if (is500Error) {
+				if (isOfflineLikeError || isServerSideError) {
 					this._serverWarning = errorMessage;
 				}