Unify Vector-related constant naming scheme across Web and Android im…

…plementations (#3052)

## Description

Rename constant determining whether magnitude is sufficient to
`MINIMAL_RECOGNIZABLE_MAGNITUDE` on both `Web` and `Android`

## Test plan

not applicable

android/src/main/java/com/swmansion/gesturehandler/core/Vector.kt

@@ -13,7 +13,7 @@ class Vector(val x: Double, val y: Double) {
   val magnitude = hypot(x, y)
 
   init {
-    val isMagnitudeSufficient = magnitude > MINIMAL_MAGNITUDE
+    val isMagnitudeSufficient = magnitude > MINIMAL_RECOGNIZABLE_MAGNITUDE
 
     unitX = if (isMagnitudeSufficient) x / magnitude else 0.0
     unitY = if (isMagnitudeSufficient) y / magnitude else 0.0
@@ -39,7 +39,7 @@ class Vector(val x: Double, val y: Double) {
     private val VECTOR_LEFT_DOWN: Vector = Vector(-1.0, 1.0)
 
     private val VECTOR_ZERO: Vector = Vector(0.0, 0.0)
-    private const val MINIMAL_MAGNITUDE = 0.1
+    private const val MINIMAL_RECOGNIZABLE_MAGNITUDE = 0.1
 
     fun fromDirection(direction: Int): Vector =
       when (direction) {

src/web/constants.ts

@@ -1,2 +1,2 @@
 export const DEFAULT_TOUCH_SLOP = 15;
-export const MINIMAL_FLING_VELOCITY = 0.1;
+export const MINIMAL_RECOGNIZABLE_MAGNITUDE = 0.1;

src/web/tools/Vector.ts

@@ -1,5 +1,5 @@
 import { DiagonalDirections, Directions } from '../../Directions';
-import { MINIMAL_FLING_VELOCITY } from '../constants';
+import { MINIMAL_RECOGNIZABLE_MAGNITUDE } from '../constants';
 import PointerTracker from './PointerTracker';
 
 export default class Vector {
@@ -14,14 +14,15 @@ export default class Vector {
     this.y = y;
 
     this._magnitude = Math.hypot(this.x, this.y);
-    const isMagnitudeSufficient = this._magnitude > MINIMAL_FLING_VELOCITY;
+    const isMagnitudeSufficient =
+      this._magnitude > MINIMAL_RECOGNIZABLE_MAGNITUDE;
 
     this.unitX = isMagnitudeSufficient ? this.x / this._magnitude : 0;
     this.unitY = isMagnitudeSufficient ? this.y / this._magnitude : 0;
   }
 
   static fromDirection(direction: Directions | DiagonalDirections): Vector {
-    return DirectionToVectorMappings.get(direction)!;
+    return DirectionToVectorMappings.get(direction) ?? new Vector(0, 0);
   }
 
   static fromVelocity(tracker: PointerTracker, pointerId: number) {