Fix rebased task channel checks

desktop/scripts/check-file-sizes.mjs

@@ -145,9 +145,10 @@ const overrides = new Map([
   // surface for now.
   ["src/features/channels/ui/ChannelPane.tsx", 1415],
   // continued-agent-conversations: channel task-tab state, deep-link task
-  // routing, and side-panel suppression sit at the channel orchestration seam.
+  // routing, side-panel suppression, and task-link route target plumbing sit at
+  // the channel orchestration seam.
   // latest main rebase threads additional header routing through this seam.
-  ["src/features/channels/ui/ChannelScreen.tsx", 1040],
+  ["src/features/channels/ui/ChannelScreen.tsx", 1080],
   // continued-agent-conversations: composer notice banner for read-only agent
   // conversations.
   ["src/features/messages/ui/MessageComposer.tsx", 1010],

desktop/src/features/messages/ui/useAnchoredScroll.ts

@@ -189,6 +189,7 @@ export function useAnchoredScroll({
   // jumping to bottom or to the target message for the new view.
   // biome-ignore lint/correctness/useExhaustiveDependencies: resetKey is intentionally the sole trigger — it includes channel identity plus route-specific layout state.
   React.useLayoutEffect(() => {
+    void scrollScopeKey;
     anchorRef.current = { kind: "at-bottom" };
     setIsAtBottom(true);
     setNewMessageCount(0);
@@ -459,6 +460,7 @@ export function useAnchoredScroll({
   // ---------------------------------------------------------------------------
   // biome-ignore lint/correctness/useExhaustiveDependencies: resetKey is a deliberate re-subscription trigger — the effect body reads only the stable refs, but on route identity changes the keyed scroll container remounts and contentRef.current becomes a fresh node, so the observer must disconnect from the previous route's detached node and re-observe the live one.
   React.useEffect(() => {
+    void scrollScopeKey;
     const content = contentRef.current;
     if (!content || typeof ResizeObserver === "undefined") return;
     const observer = new ResizeObserver(() => {