refactor(web): replace slideout panel window event with jotai atom (fixes #1358)

Replace the `SLIDEOUT_PANEL_OPENED_EVENT` window event with a
`slideoutOpenedTickAtom` jotai atom. The dispatcher in
`SidebarSlideOutPanel` now bumps the tick via `useSetAtom`, and the
listener in `Thread` reads it via `useAtomValue` and reacts on change
behind a ref guard that skips the initial render — preserving the
one-shot-per-open semantics of the previous event.

This removes the implicit cross-module string contract, makes the
signal traceable through React DevTools / jotai inspector, and lets
TypeScript catch typos that the string-based event API silently
swallowed.

surfsense_web/components/assistant-ui/thread.tsx

@@ -105,7 +105,7 @@ import { useMediaQuery } from "@/hooks/use-media-query";
 import { useElectronAPI } from "@/hooks/use-platform";
 import { captureDisplayToPngDataUrl } from "@/lib/chat/display-media-capture";
 import { getMentionDocKey } from "@/lib/chat/mention-doc-key";
-import { SLIDEOUT_PANEL_OPENED_EVENT } from "@/lib/layout-events";
+import { slideoutOpenedTickAtom } from "@/lib/layout-events";
 import { cn } from "@/lib/utils";
 
 const COMPOSER_PLACEHOLDER = "Ask anything, type / for prompts, type @ to mention docs";
@@ -478,15 +478,18 @@ const Composer: FC = () => {
 		editorRef.current?.focus();
 	}, [isDesktop, showDocumentPopover, showPromptPicker, threadId]);
 
-	// Close document picker when a slide-out panel (inbox, etc.) opens.
+	// Close document picker when a sidebar slide-out panel (inbox, etc.) opens.
+	const slideoutOpenedTick = useAtomValue(slideoutOpenedTickAtom);
+	const isFirstSlideoutTickRef = useRef(true);
 	useEffect(() => {
-		const handler = () => {
+		void slideoutOpenedTick;
-			setShowDocumentPopover(false);
+		if (isFirstSlideoutTickRef.current) {
-			setMentionQuery("");
+			isFirstSlideoutTickRef.current = false;
-		};
+			return;
-		window.addEventListener(SLIDEOUT_PANEL_OPENED_EVENT, handler);
+		}
-		return () => window.removeEventListener(SLIDEOUT_PANEL_OPENED_EVENT, handler);
+		setShowDocumentPopover(false);
-	}, []);
+		setMentionQuery("");
+	}, [slideoutOpenedTick]);
 
 	// Sync editor text into assistant-ui's composer and mirror the chip
 	// atom from the editor's reported ``docs``. The editor is the

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

@@ -1,9 +1,10 @@
 "use client";
 
+import { useSetAtom } from "jotai";
 import { AnimatePresence, motion } from "motion/react";
 import { useCallback, useEffect } from "react";
 import { useIsMobile } from "@/hooks/use-mobile";
-import { SLIDEOUT_PANEL_OPENED_EVENT } from "@/lib/layout-events";
+import { slideoutOpenedTickAtom } from "@/lib/layout-events";
 
 interface SidebarSlideOutPanelProps {
 	open: boolean;
@@ -29,12 +30,13 @@ export function SidebarSlideOutPanel({
 	children,
 }: SidebarSlideOutPanelProps) {
 	const isMobile = useIsMobile();
+	const bumpSlideoutOpenedTick = useSetAtom(slideoutOpenedTickAtom);
 
 	useEffect(() => {
 		if (open) {
-			window.dispatchEvent(new Event(SLIDEOUT_PANEL_OPENED_EVENT));
+			bumpSlideoutOpenedTick((tick) => tick + 1);
 		}
-	}, [open]);
+	}, [open, bumpSlideoutOpenedTick]);
 
 	const handleEscape = useCallback(
 		(e: KeyboardEvent) => {

surfsense_web/lib/layout-events.ts

@@ -1 +1,9 @@
-export const SLIDEOUT_PANEL_OPENED_EVENT = "slideout-panel-opened";
+import { atom } from "jotai";
+
+/**
+ * Tick counter that increments each time a sidebar slide-out panel opens.
+ * Consumers read this with `useAtomValue` and react to it changing — guard
+ * the initial render with a ref so the effect only fires on subsequent
+ * opens, matching the one-shot semantics of the previous window event.
+ */
+export const slideoutOpenedTickAtom = atom(0);