Make post-seek mini-tab resync immune to page age

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

apps/dashboard/src/app/(main)/(protected)/projects/[projectId]/session-replays/session-replay-machine.test.ts

@@ -896,6 +896,24 @@ describe("session-replay-machine", () => {
       });
       expect(hasEffect(effects, "sync_mini_tabs")).toBe(true);
     });
+
+    it("resyncs mini tabs after a seek even within the first sync interval of page age", () => {
+      const state = twoTabReadyState({
+        playbackMode: "playing",
+        lastMiniTabSyncWallMs: 0,
+      });
+      const afterSeek = dispatch(state, {
+        type: "SEEK",
+        globalOffsetMs: 2000,
+        nowMs: 100,
+      });
+      const { effects } = dispatch(afterSeek.state, {
+        type: "TICK",
+        nowMs: 300,
+        activeReplayerLocalTimeMs: 1000,
+      });
+      expect(hasEffect(effects, "sync_mini_tabs")).toBe(true);
+    });
   });
 
   describe("areStatesRenderEquivalent", () => {

apps/dashboard/src/app/(main)/(protected)/projects/[projectId]/session-replays/session-replay-machine.ts

@@ -960,8 +960,10 @@ export function replayReducer(state: ReplayState, action: ReplayAction): Reducer
           suppressAutoFollowUntilWallMs: action.nowMs + 400,
           prematureFinishRetryLocalMs: null,
           playingWithoutProgressSinceMs: null,
-          // Reset the throttle so the next TICK re-syncs mini tabs to the new position
-          lastMiniTabSyncWallMs: 0,
+          // Reset the throttle so the next TICK re-syncs mini tabs to the new
+          // position regardless of page age (0 would still throttle during the
+          // first MINI_TAB_SYNC_INTERVAL_MS after page load).
+          lastMiniTabSyncWallMs: action.nowMs - MINI_TAB_SYNC_INTERVAL_MS,
           playerError: null,
         },
         effects,