feat: enhance indexing state management and inbox count formatting

- Improved indexing state management by refining the logic for handling notifications, ensuring accurate updates for in-progress, completed, and failed states.
- Introduced a new utility function to format inbox counts, displaying numbers up to 999 and using "k+" for larger counts, enhancing user interface clarity.
- Updated sidebar components to utilize the new inbox count formatting, improving the overall user experience.

surfsense_web/components/layout/ui/sidebar/InboxSidebar.tsx

@@ -70,6 +70,17 @@ function getInitials(name: string | null | undefined, email: string | null | und
 	return "U";
 }
 
+/**
+ * Format count for display: shows numbers up to 999, then "1k+", "2k+", etc.
+ */
+function formatInboxCount(count: number): string {
+	if (count <= 999) {
+		return count.toString();
+	}
+	const thousands = Math.floor(count / 1000);
+	return `${thousands}k+`;
+}
+
 /**
  * Get display name for connector type
  */
@@ -732,7 +743,7 @@ export function InboxSidebar({
 										<AtSign className="h-4 w-4" />
 										<span>{t("mentions") || "Mentions"}</span>
 										<span className="inline-flex items-center justify-center min-w-5 h-5 px-1.5 rounded-full bg-primary/20 text-muted-foreground text-xs font-medium">
-											{unreadMentionsCount}
+											{formatInboxCount(unreadMentionsCount)}
 										</span>
 									</span>
 								</TabsTrigger>
@@ -744,7 +755,7 @@ export function InboxSidebar({
 										<History className="h-4 w-4" />
 										<span>{t("status") || "Status"}</span>
 										<span className="inline-flex items-center justify-center min-w-5 h-5 px-1.5 rounded-full bg-primary/20 text-muted-foreground text-xs font-medium">
-											{unreadStatusCount}
+											{formatInboxCount(unreadStatusCount)}
 										</span>
 									</span>
 								</TabsTrigger>