Stabilize channels UX, reload flow, and i18n consistency

electron/gateway/manager.ts

@@ -220,6 +220,7 @@ export class GatewayManager extends EventEmitter {
   }> = new Map();
   private deviceIdentity: DeviceIdentity | null = null;
   private restartDebounceTimer: NodeJS.Timeout | null = null;
+  private reloadDebounceTimer: NodeJS.Timeout | null = null;
   private lifecycleEpoch = 0;
   private deferredRestartPending = false;
   private restartInFlight: Promise<void> | null = null;
@@ -640,6 +641,71 @@ export class GatewayManager extends EventEmitter {
     }, delayMs);
   }
 
+  /**
+   * Ask the Gateway process to reload config in-place when possible.
+   * Falls back to restart on unsupported platforms or signaling failures.
+   */
+  async reload(): Promise<void> {
+    if (this.isRestartDeferred()) {
+      this.markDeferredRestart('reload');
+      return;
+    }
+
+    if (!this.process?.pid || this.status.state !== 'running') {
+      logger.warn('Gateway reload requested while not running; falling back to restart');
+      await this.restart();
+      return;
+    }
+
+    if (process.platform === 'win32') {
+      logger.debug('Windows detected, falling back to Gateway restart for reload');
+      await this.restart();
+      return;
+    }
+
+    const connectedForMs = this.status.connectedAt
+      ? Date.now() - this.status.connectedAt
+      : Number.POSITIVE_INFINITY;
+
+    // Avoid signaling a process that just came up; it will already read latest config.
+    if (connectedForMs < 8000) {
+      logger.info(`Gateway connected ${connectedForMs}ms ago, skipping reload signal`);
+      return;
+    }
+
+    try {
+      process.kill(this.process.pid, 'SIGUSR1');
+      logger.info(`Sent SIGUSR1 to Gateway for config reload (pid=${this.process.pid})`);
+      // Some gateway builds do not handle SIGUSR1 as an in-process reload.
+      // If process state doesn't recover quickly, fall back to restart.
+      await new Promise((resolve) => setTimeout(resolve, 1500));
+      if (this.status.state !== 'running' || !this.process?.pid) {
+        logger.warn('Gateway did not stay running after reload signal, falling back to restart');
+        await this.restart();
+      }
+    } catch (error) {
+      logger.warn('Gateway reload signal failed, falling back to restart:', error);
+      await this.restart();
+    }
+  }
+
+  /**
+   * Debounced reload — coalesces multiple rapid config-change events into one
+   * in-process reload when possible.
+   */
+  debouncedReload(delayMs = 1200): void {
+    if (this.reloadDebounceTimer) {
+      clearTimeout(this.reloadDebounceTimer);
+    }
+    logger.debug(`Gateway reload debounced (will fire in ${delayMs}ms)`);
+    this.reloadDebounceTimer = setTimeout(() => {
+      this.reloadDebounceTimer = null;
+      void this.reload().catch((err) => {
+        logger.warn('Debounced Gateway reload failed:', err);
+      });
+    }, delayMs);
+  }
+
   /**
    * Clear all active timers
    */
@@ -660,6 +726,10 @@ export class GatewayManager extends EventEmitter {
       clearTimeout(this.restartDebounceTimer);
       this.restartDebounceTimer = null;
     }
+    if (this.reloadDebounceTimer) {
+      clearTimeout(this.reloadDebounceTimer);
+      this.reloadDebounceTimer = null;
+    }
   }
 
   /**