packages/app/src/pages/session/use-session-scroll-dock.ts (2)

109-127: 💤 Low value

Extract the 3s lock window into a named constant.

The lock lifetime is the central tuning knob for this feature (it bounds how long a browser-induced reset can be repaired without user input), but it's a bare 3_000 literal in the middle of armBottomFollowLock. Lifting it to a named constant at module scope (e.g. BOTTOM_FOLLOW_LOCK_MS) makes the intent obvious, gives tests a single place to override timing if needed, and documents the decision.

♻️ Proposed change

+const BOTTOM_FOLLOW_LOCK_MS = 3_000
+
 ...
   const armBottomFollowLock = (owner?: string) => {
     if (bottomFollowLockTimer !== undefined) clearTimeout(bottomFollowLockTimer)
     bottomFollowLockOwner = owner
     setBottomFollowLocked(true)
-    bottomFollowLockTimer = setTimeout(cancelBottomFollowLock, 3_000)
+    bottomFollowLockTimer = setTimeout(cancelBottomFollowLock, BOTTOM_FOLLOW_LOCK_MS)
   }

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@packages/app/src/pages/session/use-session-scroll-dock.ts` around lines 109 -
127, Extract the hard-coded 3_000 timeout into a module-level named constant
(e.g., BOTTOM_FOLLOW_LOCK_MS) and use it inside armBottomFollowLock when calling
setTimeout; update any related references (bottomFollowLockTimer,
armBottomFollowLock, cancelBottomFollowLock, bottomFollowLocked,
bottomFollowLockOwner) to rely on that constant so the lock lifetime is
configurable and clearly documented for tests and future tuning.

---

175-183: 💤 Low value

Document the cancel-on-mismatch semantics of restoreBottomIfLocked.

When a caller passes an owner that does not match the active lock, this helper not only returns false but also cancels the lock outright. This is exercised by the "lock belongs to another session" unit test, but the contract is non-obvious from the function shape — most readers will assume a query helper is side-effect-free. A short comment explaining the intent (a different session interacting with the dock invalidates a stale lock) will save future maintainers a code-archeology trip.

📝 Proposed comment

+  // Querying with a non-matching owner cancels the lock: any interaction
+  // identifying itself as a different session means the previously-armed
+  // lock is stale and must not survive into the new session's scroll loop.
   const restoreBottomIfLocked = (owner?: string) => {
     if (!bottomFollowLockedFor(owner)) {
       if (bottomFollowLocked() && owner !== undefined) cancelBottomFollowLock()
       return false
     }

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@packages/app/src/pages/session/use-session-scroll-dock.ts` around lines 175 -
183, Add a brief doc comment above restoreBottomIfLocked explaining its
cancel-on-mismatch semantics: when an owner argument is provided that does not
match the current lock (checked via bottomFollowLockedFor), the function not
only returns false but also clears the active lock by calling
cancelBottomFollowLock; this behavior intentionally invalidates stale locks from
other sessions. Mention the related functions bottomFollowLocked,
cancelBottomFollowLock, followBottom, and scheduleScrollState (and scroller) so
readers understand the side effect and when followBottom/scheduleScrollState
will be invoked.