fix(dashboard): getTimeRange returns full data extent under an active TimeWindow (#284)

FastSenseWidget.getTimeRange() reports the cached data extent for the navigator/preview, which must be independent of the per-widget TimeWindow_. But updateTimeRangeCache()'s fast path trusted the already-pulled x as the full extent — and when a TimeWindow_ is set, callers pass the WINDOWED pull (pullData_ -> Tag.getXYRange). That set CachedXMax to the window end, so getTimeRange() returned [fullStart, windowEnd] (CachedXMin is sticky, which is why only the max was wrong).

Fix: only take the passed-x fast path when TimeWindow_ is empty; with a window active, fall through to the Tag's own (full) getTimeRange()/getXY(). No extra work in the common windowless case; one O(1) Tag.getTimeRange() when windowed.

Regression guard: existing tests/test_dashboard_time_window.m testPreviewStillFull (was failing on main). Verified fresh-process: repro fixed (tMax full extent), test_dashboard_time_window 8/8, and 95/96 across FastSenseWidget/preview/dashboard suites (the 1 is the pre-existing headless TestDashboardEngine/testTimerContinuesAfterError, unrelated).

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: HanSur94

libs/Dashboard/FastSenseWidget.m

@@ -1775,8 +1775,14 @@ function updateTimeRangeCache(obj, x)
         %   no second arg and get the existing pull behavior unchanged.
             if ~isempty(obj.Tag)
                 try
-                    if nargin >= 2 && ~isempty(x)
+                    if nargin >= 2 && ~isempty(x) && isempty(obj.TimeWindow_)
                         % Use the already-pulled x — avoids a redundant getXY().
+                        % Only trust it as the full extent when no TimeWindow_
+                        % is active: with a window set, callers pass the WINDOWED
+                        % pull (pullData_ -> getXYRange), which must not poison
+                        % the full-extent cache that getTimeRange() reports for
+                        % the navigator/preview. When windowed, fall through to
+                        % the Tag's own (full) range below.
                         n = numel(x);
                         tMin = x(1);
                         tMax = x(n);