feat(Settings): add wrote flag to SavedJson and update writeSettings logic to indicate if files were written

src/app/components/DeviceDetailOverlay.tsx

@@ -413,7 +413,9 @@ export default function DeviceDetailOverlay({
                 )}
               </div>
 
-              {deviceData.cache !== undefined && (
+              {(deviceData.cache !== undefined ||
+                (deviceData.base_url ?? '').includes('://') ||
+                (deviceData.url ?? '').includes('://')) && (
                 <div>
                   <label className="text-sm text-neutral-500 block mb-2">Cache</label>
                   <div className="flex gap-2">

src/app/settings.ts

@@ -167,6 +167,8 @@ export async function readSettings(): Promise<ReadSettingsResult | null> {
 export interface SavedJson {
   configJson:  string;
   devicesJson: string;
+  /** True if at least one file was actually written. */
+  wrote: boolean;
 }
 
 /** Serialize config into the two canonical JSON strings without writing anything. */
@@ -175,6 +177,7 @@ export function serializeConfig(config: SettingsConfig): SavedJson {
   return {
     configJson:  JSON.stringify(mainConfig,  null, 2) + '\n',
     devicesJson: JSON.stringify({ devices }, null, 2) + '\n',
+    wrote: false,
   };
 }
 
@@ -195,7 +198,7 @@ export async function writeSettings(
   const writeConfig  = !lastSaved || next.configJson  !== lastSaved.configJson;
   const writeDevices = !lastSaved || next.devicesJson !== lastSaved.devicesJson;
 
-  if (!writeConfig && !writeDevices) return next;
+  if (!writeConfig && !writeDevices) return { ...next, wrote: false };
 
   try { await createFolder(SETTINGS_DIR, true); } catch { /* exists */ }
 
@@ -216,7 +219,7 @@ export async function writeSettings(
     }
   } catch { /* /sd unreachable — skip mirror */ }
 
-  return next;
+  return { ...next, wrote: true };
 }
 
 export type SaveStatus =
@@ -327,12 +330,16 @@ export function useSettings(): UseSettingsResult {
     setPendingCount(0);
     setSaveStatus('saving');
     try {
-      lastSavedRef.current = await writeSettings(configRef.current, lastSavedRef.current);
-      setSaveStatus('saved');
-      // Drop the "saved" badge after a short delay so it doesn't linger.
-      savedTimerRef.current = window.setTimeout(() => {
-        setSaveStatus((s) => (s === 'saved' ? 'idle' : s));
-      }, SAVED_INDICATOR_MS);
+      const result = await writeSettings(configRef.current, lastSavedRef.current);
+      lastSavedRef.current = result;
+      if (result.wrote) {
+        setSaveStatus('saved');
+        savedTimerRef.current = window.setTimeout(() => {
+          setSaveStatus((s) => (s === 'saved' ? 'idle' : s));
+        }, SAVED_INDICATOR_MS);
+      } else {
+        setSaveStatus('idle');
+      }
     } catch (e) {
       // Roll back: the change is still pending.
       dirtyRef.current = true;