[merydian]

Description

The member QDateTimeEdits of QgsTemporalControllerWidget currently do not have a time specification set.

From the QDateTimeEdit docs:

When setting this property the timespec of the QDateTimeEdit remains the same and the timespec of the new QDateTime is ignored.

When then reading from a QDateTimeEdit again after setting a CET, there will currently be a time shift. Thus the new test before fails:

********* Start testing of TestQgsTemporalControllerWidget *********
Config: Using QtTest library 6.11.2, Qt 6.11.2 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC 16.2.1 20260819 (Red Hat 16.2.1-2)), fedora 44
PASS   : TestQgsTemporalControllerWidget::initTestCase()
FAIL!  : TestQgsTemporalControllerWidget::testDatePersists() Compared values are not the same
   Actual   (mTemporalControllerWidget->mStartDateTime->date()): 2005/12/31
   Expected (start.date())                                     : 2006/01/01
   Loc: [/root/QGIS/tests/src/gui/testqgstemporalcontrollerwidget.cpp(84)]
PASS   : TestQgsTemporalControllerWidget::cleanupTestCase()
Totals: 2 passed, 1 failed, 0 skipped, 0 blacklisted, 572ms
********* Finished testing of TestQgsTemporalControllerWidget *********

(see: https://github.com/qgis/QGIS/actions/runs/40578527565/job/122509265577)

It's a 1h shift, since CET is UTC+1. The year here switches, since its around 1st of January.

This PR sets the time specification of the member QDateTimeEdits of QgsTemporalControllerWidget to excpect local time. This prevents the time shift when rereading the time from e.g. mStartDateTime in QgsTemporalControllerWidget.

Closes #67917

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[github-actions]

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