feat: add support for directional power flow for individual objects

Integrated commit c00dd74 from hobbymachinist/power-flow-card-plus (PR flixlix#873):
**Changes:**
- Modified `getIndividualState()` to return signed values (removed Math.abs)
- Added `absState` calculation in `getIndividualObject()` to handle negative states
- State values now retain directionality while display shows absolute values
- Enables proper animation inversion for bidirectional devices (V2H/V2G)
**Impact:**
- Individual objects can now properly display power flow direction
- Supports Vehicle-to-Home (V2H) and Vehicle-to-Grid (V2G) scenarios
- Animation correctly inverts when power flow reverses
**Note on commit 2342177 from dpayk/power-flow-card-plus:**
This commit fixes battery charging flow calculation, but a more comprehensive
solution was already applied via PR flixlix#878 which handles grid export and uses
more robust Math.max/Math.min logic.
Build verified successful.

Author: foXaCe

src/states/raw/individual/getIndividualObject.ts

@@ -75,12 +75,13 @@ export const getIndividualObject = (hass: HomeAssistant, field: IndividualDevice
   const userConfiguredInvertAnimation = field?.inverted_animation || false;
   const invertAnimation = isStateNegative ? !userConfiguredInvertAnimation : userConfiguredInvertAnimation;
   const color = field?.color && typeof field?.color === "string" ? field?.color : null;
+  const absState = state && state < 0 ? -state : state;
 
   return {
     field,
     entity,
     has,
-    state,
+    state: absState,
     displayZero,
     displayZeroTolerance,
     icon: computeFieldIcon(hass, field, "mdi:flash"),

src/states/raw/individual/index.ts

@@ -11,7 +11,7 @@ export const getIndividualState = (hass: HomeAssistant, field: IndividualDeviceT
 
   const individualStateWatts = getEntityStateWatts(hass, entity);
 
-  return Math.abs(individualStateWatts);
+  return individualStateWatts;
 };
 
 export const getIndividualSecondaryState = (hass: HomeAssistant, field: IndividualDeviceType) => {