fix(fusion_clock): Anchor Date is a real date picker (Date field, manual persist)

The Pay Period Anchor Date was a free-text Char. Make it a fields.Date (date
picker) persisted manually in get_values/set_values as 'YYYY-MM-DD' under
fusion_clock.pay_period_start (res.config.settings Date fields don't round-trip
via config_parameter in Odoo 19). Reader code unchanged. Bump 3.15.1 -> 3.15.2.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

fusion_clock/__manifest__.py

@@ -5,7 +5,7 @@
 
 {
     'name': 'Fusion Clock',
-    'version': '19.0.3.15.1',
+    'version': '19.0.3.15.2',
     'category': 'Human Resources/Attendances',
     'summary': 'Complete Employee T&A with Geofencing, Shifts, Penalties, Overtime, Kiosk, Dashboard & Payroll Export',
     'description': """

fusion_clock/models/res_config_settings.py

@@ -199,10 +199,15 @@ class ResConfigSettings(models.TransientModel):
         default='biweekly',
         help="How often attendance reports are generated.",
     )
-    fclk_pay_period_start = fields.Char(
+    # NOTE: a real Date field (date picker), but NOT a config_parameter field —
+    # res.config.settings Date fields don't round-trip via config_parameter in
+    # Odoo 19, so it is persisted manually in get_values/set_values as a
+    # 'YYYY-MM-DD' string under fusion_clock.pay_period_start (same pattern as
+    # fclk_report_recipient_user_ids).
+    fclk_pay_period_start = fields.Date(
         string='Pay Period Anchor Date',
-        config_parameter='fusion_clock.pay_period_start',
-        help="Start date for pay period calculations (YYYY-MM-DD format).",
+        help="The pay-period start date. Reports and the Bi-Weekly Period "
+             "filter/picker count forward from this anchor.",
     )
     fclk_auto_generate_reports = fields.Boolean(
         string='Auto-Generate Reports',
@@ -293,6 +298,11 @@ class ResConfigSettings(models.TransientModel):
                          ','.join(str(uid) for uid in self.fclk_report_recipient_user_ids.ids))
         else:
             ICP.set_param('fusion_clock.report_recipient_user_ids', '')
+        if self.fclk_pay_period_start:
+            ICP.set_param('fusion_clock.pay_period_start',
+                          fields.Date.to_string(self.fclk_pay_period_start))
+        else:
+            ICP.set_param('fusion_clock.pay_period_start', '')
 
     @api.model
     def get_values(self):
@@ -308,4 +318,11 @@ class ResConfigSettings(models.TransientModel):
                 res['fclk_report_recipient_user_ids'] = [(6, 0, user_ids)]
             except (ValueError, TypeError):
                 pass
+        anchor_str = ICP.get_param('fusion_clock.pay_period_start', '')
+        if anchor_str:
+            try:
+                # Truncate to 'YYYY-MM-DD' to tolerate any legacy datetime-ish value.
+                res['fclk_pay_period_start'] = fields.Date.to_date(anchor_str[:10])
+            except (ValueError, TypeError):
+                pass
         return res