feat(services): add average indicator for hourly resolution in charts

Add visual indicators to distinguish hourly aggregated data from
original 15-minute interval data in ApexCharts output.

Changes:
- Chart title: Append localized suffix like "(Ø hourly)" / "(Ø stündlich)"
- Y-axis label: Append "(Ø)" suffix, e.g., "øre/kWh (Ø)"

The suffix pattern avoids confusion with Scandinavian currency symbols
(øre/öre) which look similar to the average symbol (Ø) when used as prefix.

Added hourly_suffix translations for all 5 languages (en, de, sv, nb, nl).

Impact: Users can now clearly see when a chart displays averaged hourly
data rather than original 15-minute prices.

custom_components/tibber_prices/custom_translations/de.json

@@ -2,6 +2,7 @@
     "apexcharts": {
         "title_rating_level": "Preisphasen Tagesverlauf",
         "title_level": "Preisniveau",
+        "hourly_suffix": "(Ø stündlich)",
         "best_price_period_name": "Bestpreis-Zeitraum",
         "peak_price_period_name": "Spitzenpreis-Zeitraum",
         "notification": {

custom_components/tibber_prices/custom_translations/en.json

@@ -2,6 +2,7 @@
     "apexcharts": {
         "title_rating_level": "Price Phases Daily Progress",
         "title_level": "Price Level",
+        "hourly_suffix": "(Ø hourly)",
         "best_price_period_name": "Best Price Period",
         "peak_price_period_name": "Peak Price Period",
         "notification": {

custom_components/tibber_prices/custom_translations/nb.json

@@ -2,6 +2,7 @@
     "apexcharts": {
         "title_rating_level": "Prisfaser dagsfremdrift",
         "title_level": "Prisnivå",
+        "hourly_suffix": "(Ø per time)",
         "best_price_period_name": "Beste prisperiode",
         "peak_price_period_name": "Toppprisperiode",
         "notification": {
@@ -505,4 +506,4 @@
         "now": "nå"
     },
     "attribution": "Data levert av Tibber"
-}
+}

custom_components/tibber_prices/custom_translations/nl.json

@@ -2,6 +2,7 @@
     "apexcharts": {
         "title_rating_level": "Prijsfasen dagverloop",
         "title_level": "Prijsniveau",
+        "hourly_suffix": "(Ø per uur)",
         "best_price_period_name": "Beste prijsperiode",
         "peak_price_period_name": "Piekprijsperiode",
         "notification": {
@@ -505,4 +506,4 @@
         "now": "nu"
     },
     "attribution": "Gegevens geleverd door Tibber"
-}
+}

custom_components/tibber_prices/custom_translations/sv.json

@@ -2,6 +2,7 @@
     "apexcharts": {
         "title_rating_level": "Prisfaser dagsprogress",
         "title_level": "Prisnivå",
+        "hourly_suffix": "(Ø per timme)",
         "best_price_period_name": "Bästa prisperiod",
         "peak_price_period_name": "Toppprisperiod",
         "notification": {
@@ -505,4 +506,4 @@
         "now": "nu"
     },
     "attribution": "Data tillhandahålls av Tibber"
-}
+}

custom_components/tibber_prices/services/get_apexcharts_yaml.py

@@ -314,6 +314,10 @@ async def handle_apexcharts_yaml(call: ServiceCall) -> dict[str, Any]:  # noqa:
     use_subunit = display_mode == DISPLAY_MODE_SUBUNIT
     price_unit = get_display_unit_string(config_entry, currency)
 
+    # Add average symbol suffix for hourly resolution (suffix to avoid confusion with øre/öre)
+    if resolution == "hourly":
+        price_unit = f"{price_unit} (Ø)"
+
     # Get entity registry for mapping
     entity_registry = async_get_entity_registry(hass)
 
@@ -532,6 +536,11 @@ async def handle_apexcharts_yaml(call: ServiceCall) -> dict[str, Any]:  # noqa:
         day_translated = get_translation(["selector", "day", "options", day], user_language) or day.capitalize()
         title = f"{title} - {day_translated}"
 
+    # Add hourly suffix to title when using hourly resolution
+    if resolution == "hourly":
+        hourly_suffix = get_translation(["apexcharts", "hourly_suffix"], user_language) or "(Ø hourly)"
+        title = f"{title} {hourly_suffix}"
+
     # Configure span based on selected day
     # For rolling window modes, use config-template-card for dynamic config
     if day == "yesterday":