fix: resolve lint warnings in hooks, store, and sentry modules

- Move ref assignments from render to useEffect (useViewportCommentRead,
  useViewportObserver)
- Copy ref.current to local variable for effect cleanup closure
- Add eslint-disable for intentional ref-as-cache pattern
  (useStableTeamMentionMeta)
- Fix !== always-true comparison between undefined and null (store)
- Add missing return types (sentry, composerDraftStorage)
- Remove unused import isLeadAgentType (memberHelpers)
- Suppress naming-convention warning for Vite-injected __APP_VERSION__

src/renderer/hooks/useStableTeamMentionMeta.ts

@@ -88,6 +88,10 @@ export function useStableTeamMentionMeta(teams: readonly TeamSummary[]): TeamMen
     null
   );
 
+  // Intentional ref-as-cache pattern: avoids allocating a new object every
+  // render while still returning a referentially-stable value when the
+  // underlying data hasn't changed.
+
   if (
     stableRef.current === null ||
     !areTeamMentionEntriesEqual(stableRef.current.entries, entries)
@@ -98,5 +102,6 @@ export function useStableTeamMentionMeta(teams: readonly TeamSummary[]): TeamMen
     };
   }
 
+  // eslint-disable-next-line react-hooks/refs -- stable ref cache pattern
   return stableRef.current.value;
 }

src/renderer/hooks/useViewportCommentRead.ts

@@ -47,8 +47,11 @@ export function useViewportCommentRead({
   const seenIdsRef = useRef<Set<string>>(new Set());
   const teamNameRef = useRef(teamName);
   const taskIdRef = useRef(taskId);
-  teamNameRef.current = teamName;
-  taskIdRef.current = taskId;
+
+  useEffect(() => {
+    teamNameRef.current = teamName;
+    taskIdRef.current = taskId;
+  }, [teamName, taskId]);
 
   // Reset tracked state when team/task changes
   useEffect(() => {

src/renderer/hooks/useViewportObserver.ts

@@ -51,7 +51,10 @@ export function useViewportObserver({
   registerElement: (value: string) => (el: HTMLElement | null) => void;
 } {
   const onVisibleChangeRef = useRef(onVisibleChange);
-  onVisibleChangeRef.current = onVisibleChange;
+
+  useEffect(() => {
+    onVisibleChangeRef.current = onVisibleChange;
+  }, [onVisibleChange]);
 
   const observerRef = useRef<IntersectionObserver | null>(null);
   const visibleValuesRef = useRef<Set<string>>(new Set());
@@ -67,6 +70,9 @@ export function useViewportObserver({
     // and produce false positives for all visible elements.
     if (!root) return;
 
+    // Capture ref values for cleanup closure
+    const visibleValues = visibleValuesRef.current;
+
     const observer = new IntersectionObserver(
       (entries) => {
         let changed = false;
@@ -75,19 +81,19 @@ export function useViewportObserver({
           if (!value) continue;
 
           if (entry.isIntersecting) {
-            if (!visibleValuesRef.current.has(value)) {
-              visibleValuesRef.current.add(value);
+            if (!visibleValues.has(value)) {
+              visibleValues.add(value);
               changed = true;
             }
           } else {
-            if (visibleValuesRef.current.has(value)) {
-              visibleValuesRef.current.delete(value);
+            if (visibleValues.has(value)) {
+              visibleValues.delete(value);
               changed = true;
             }
           }
         }
         if (changed) {
-          onVisibleChangeRef.current(Array.from(visibleValuesRef.current));
+          onVisibleChangeRef.current(Array.from(visibleValues));
         }
       },
       { root, threshold }
@@ -105,7 +111,7 @@ export function useViewportObserver({
     return () => {
       observer.disconnect();
       observerRef.current = null;
-      visibleValuesRef.current.clear();
+      visibleValues.clear();
     };
   }, [root, threshold]);
 

src/renderer/sentry.ts

@@ -48,7 +48,7 @@ export function initSentryRenderer(): void {
   };
 
   // eslint-disable-next-line @typescript-eslint/no-explicit-any -- cross-version @sentry/core type mismatch
-  const beforeSend = (event: any) => (telemetryAllowed ? event : null);
+  const beforeSend = (event: any): any => (telemetryAllowed ? event : null);
 
   if (window.electronAPI) {
     // Electron renderer — uses IPC transport to main process.

src/renderer/services/composerDraftStorage.ts

@@ -39,7 +39,7 @@ function storageKey(teamName: string): string {
 }
 
 /** Legacy keys used by the old three-key approach. */
-function legacyKeys(teamName: string) {
+function legacyKeys(teamName: string): { text: string; chips: string; attachments: string } {
   return {
     text: `draft:compose:${teamName}`,
     chips: `draft:compose:${teamName}:chips`,

src/renderer/store/index.ts

@@ -695,7 +695,7 @@ export function initializeNotificationListeners(): () => void {
             updateStatus: 'available',
             availableVersion: s.version ?? null,
             releaseNotes: s.releaseNotes ?? null,
-            showUpdateDialog: s.version !== dismissed,
+            showUpdateDialog: (s.version ?? null) !== dismissed,
           });
           break;
         }

src/renderer/utils/memberHelpers.ts

@@ -3,7 +3,7 @@ import {
   MEMBER_COLOR_PALETTE,
   normalizeMemberColorName,
 } from '@shared/constants/memberColors';
-import { isLeadAgentType, isLeadMember } from '@shared/utils/leadDetection';
+import { isLeadMember } from '@shared/utils/leadDetection';
 
 import type {
   LeadActivityState,

src/shared/utils/sentryConfig.ts

@@ -6,6 +6,7 @@
  * (main: process.env, renderer: import.meta.env).
  */
 
+// eslint-disable-next-line @typescript-eslint/naming-convention -- Vite `define` injects this global
 declare const __APP_VERSION__: string;
 
 /** Release identifier injected at build time via Vite `define`. */