fix(sensors)!: fix DURATION sensors displaying in minutes instead of hours

Added `suggested_unit_of_measurement=UnitOfTime.HOURS` to all 7 DURATION
sensors to prevent HA from auto-selecting minutes as the display unit.
Without this, HA would pick "min" for small values (e.g., 0.75 h) and then
display large values as "1238 Min." instead of the intended "20 Std. 38 Min."

Affected sensors:
- trend_change_in_minutes
- best_price_period_duration / peak_price_period_duration
- best_price_remaining_minutes / peak_price_remaining_minutes
- best_price_next_in_minutes / peak_price_next_in_minutes

BREAKING CHANGE: Sensor state unit changes from minutes to hours for users
whose entity registry stored "min" as the display unit (the previous default).
Automations using the raw state value (e.g., `state < 60` for "less than 60
minutes") must be updated to use hours (e.g., `state < 1`).
The state attributes `remaining_minutes` and `next_in_minutes` continue to
provide integer minutes and are unaffected.

Impact: Duration sensors now display dynamically as "X h Y min" (e.g.,
"1 h 15 min") instead of a large minutes value like "1238 Min.". Users who
manually customized the unit in HA settings are not affected.

custom_components/tibber_prices/sensor/definitions.py

@@ -524,6 +524,7 @@ FUTURE_TREND_SENSORS = (
         icon="mdi:timer-outline",
         device_class=SensorDeviceClass.DURATION,
         native_unit_of_measurement=UnitOfTime.HOURS,
+        suggested_unit_of_measurement=UnitOfTime.HOURS,
         state_class=None,  # Countdown timer: no statistics
         suggested_display_precision=2,
         entity_registry_enabled_default=True,
@@ -685,6 +686,7 @@ BEST_PRICE_TIMING_SENSORS = (
         icon="mdi:timer",
         device_class=SensorDeviceClass.DURATION,
         native_unit_of_measurement=UnitOfTime.HOURS,
+        suggested_unit_of_measurement=UnitOfTime.HOURS,
         state_class=None,  # Duration not needed in long-term statistics
         suggested_display_precision=2,
         entity_registry_enabled_default=False,
@@ -695,6 +697,7 @@ BEST_PRICE_TIMING_SENSORS = (
         icon="mdi:timer-sand",
         device_class=SensorDeviceClass.DURATION,
         native_unit_of_measurement=UnitOfTime.HOURS,
+        suggested_unit_of_measurement=UnitOfTime.HOURS,
         state_class=None,  # Countdown timers excluded from statistics
         suggested_display_precision=2,
     ),
@@ -719,6 +722,7 @@ BEST_PRICE_TIMING_SENSORS = (
         icon="mdi:timer-outline",
         device_class=SensorDeviceClass.DURATION,
         native_unit_of_measurement=UnitOfTime.HOURS,
+        suggested_unit_of_measurement=UnitOfTime.HOURS,
         state_class=None,  # Next-start timers excluded from statistics
         suggested_display_precision=2,
     ),
@@ -738,6 +742,7 @@ PEAK_PRICE_TIMING_SENSORS = (
         icon="mdi:timer",
         device_class=SensorDeviceClass.DURATION,
         native_unit_of_measurement=UnitOfTime.HOURS,
+        suggested_unit_of_measurement=UnitOfTime.HOURS,
         state_class=None,  # Duration not needed in long-term statistics
         suggested_display_precision=2,
         entity_registry_enabled_default=False,
@@ -748,6 +753,7 @@ PEAK_PRICE_TIMING_SENSORS = (
         icon="mdi:timer-sand",
         device_class=SensorDeviceClass.DURATION,
         native_unit_of_measurement=UnitOfTime.HOURS,
+        suggested_unit_of_measurement=UnitOfTime.HOURS,
         state_class=None,  # Countdown timers excluded from statistics
         suggested_display_precision=2,
     ),
@@ -772,6 +778,7 @@ PEAK_PRICE_TIMING_SENSORS = (
         icon="mdi:timer-outline",
         device_class=SensorDeviceClass.DURATION,
         native_unit_of_measurement=UnitOfTime.HOURS,
+        suggested_unit_of_measurement=UnitOfTime.HOURS,
         state_class=None,  # Next-start timers excluded from statistics
         suggested_display_precision=2,
     ),