feat(battery): add option to set unlimited time remaining icon/text

docs/widgets/(Widget)-Battery.md

@@ -7,6 +7,7 @@
 | `class_name`            | string  | `""`                                         | Additional CSS class name for the widget.                                    |
 | `update_interval`       | integer | `5000`                                       | The interval in milliseconds to update the widget.                          |
 | `time_remaining_natural`| boolean | `False`                                      | Whether to display the remaining time in a natural format.                  |
+| `time_remaining_unlimited_icon`| string | `unlimited`                                      | Which string to use to display unlimited time remaining.                  |
 | `hide_unsupported`| boolean | `True`                                      | Whether to hide the widget if the current system does not have battery info.                  |
 | `charging_options`      | dict    | `{icon_format: '{charging_icon}', blink_charging_icon: True, blink_interval: 500}` | Options for charging state display.                                         |
 | `status_thresholds`     | dict    | `{critical: 10, low: 25, medium: 75, high: 95, full: 100}` | Thresholds for different battery statuses.                                  |
@@ -78,6 +79,7 @@ battery:
 - **class_name**: Additional CSS class name for the widget. This allows for custom styling.
 - **update_interval**: The interval in milliseconds to update the widget.
 - **time_remaining_natural**: A boolean indicating whether to display the remaining time in a natural format.
+- **time_remaining_unlimited_icon**: A string to display unlimited time remaining.
 - **hide_unsupported**: A boolean indicating whether to hide the widget if the current system does not have battery information.
 - **charging_options**: A dictionary specifying options for displaying the charging state. It contains:
   - **icon_format**: The format string for the charging icon. You can use placeholders like `{charging_icon}` and `{icon}`.
@@ -173,4 +175,4 @@ battery:
 .battery-widget .label.status-charging {
     color: #4dd0e1;
 }
-```
+```

src/core/validation/widgets/yasb/battery.py

@@ -43,6 +43,7 @@ class BatteryConfig(CustomBaseModel):
     class_name: str = ""
     update_interval: int = Field(default=5000, ge=0, le=60000)
     time_remaining_natural: bool = False
+    time_remaining_unlimited_icon: str = "unlimited"
     hide_unsupported: bool = True
     charging_options: ChargingOptionsConfig = ChargingOptionsConfig()
     status_thresholds: StatusThresholdsConfig = StatusThresholdsConfig()

src/core/widgets/yasb/battery.py

@@ -65,7 +65,7 @@ def _toggle_label(self):
     def _get_time_remaining(self) -> str:
         secs_left = self._battery_state.time_remaining
         if secs_left == POWER_TIME_UNLIMITED:
-            time_left = "unlimited"
+            time_left = self.config.time_remaining_unlimited_icon
         elif secs_left == POWER_TIME_UNKNOWN:
             time_left = "unknown"
         elif secs_left >= 0: