fix(dual-range-slider): allow equal min/max values in Lora Randomizer (#775)

Add allowEqualValues prop to DualRangeSlider component (default: false for backward compatibility).
When enabled, removes the step offset constraint that prevented min and max handles from being set to the same value.

Applied to all range sliders in LoraRandomizerSettingsView:
- LoRA Count range slider
- Model Strength Range slider
- Recommended Strength Scale slider
- Clip Strength Range slider

Backend already handles equal values correctly via rng.uniform().

vue-widgets/src/components/lora-randomizer/LoraRandomizerSettingsView.vue

@@ -48,6 +48,7 @@
           :value-max="countMax"
           :step="1"
           :default-range="{ min: 1, max: 5 }"
+          :allow-equal-values="true"
           @update:value-min="$emit('update:countMin', $event)"
           @update:value-max="$emit('update:countMax', $event)"
         />
@@ -67,6 +68,7 @@
           :default-range="{ min: -2, max: 3 }"
           :scale-mode="'segmented'"
           :segments="strengthSegments"
+          :allow-equal-values="true"
           @update:value-min="$emit('update:modelStrengthMin', $event)"
           @update:value-max="$emit('update:modelStrengthMax', $event)"
         />
@@ -101,6 +103,7 @@
           :step="0.1"
           :default-range="{ min: 0.5, max: 1.0 }"
           :disabled="!useRecommendedStrength"
+          :allow-equal-values="true"
           @update:value-min="$emit('update:recommendedStrengthScaleMin', $event)"
           @update:value-max="$emit('update:recommendedStrengthScaleMax', $event)"
         />
@@ -137,6 +140,7 @@
           :scale-mode="'segmented'"
           :segments="strengthSegments"
           :disabled="isClipStrengthDisabled"
+          :allow-equal-values="true"
           @update:value-min="$emit('update:clipStrengthMin', $event)"
           @update:value-max="$emit('update:clipStrengthMax', $event)"
         />