feat: Add configurable LoRA strength adjustment step setting

Implements issue #808 - Allow users to customize the strength
variation range for LoRA widget arrow buttons.

Changes:
- Add 'Strength Adjustment Step' setting (0.01-0.1) in settings.js
- Replace hardcoded 0.05 increments with configurable step value
- Apply to both LoRA strength and CLIP strength controls

Fixes #808

web/comfyui/loras_widget.js

@@ -14,6 +14,7 @@ import { initDrag, createContextMenu, initHeaderDrag, initReorderDrag, handleKey
 import { forwardMiddleMouseToCanvas } from "./utils.js";
 import { PreviewTooltip } from "./preview_tooltip.js";
 import { ensureLmStyles } from "./lm_styles_loader.js";
+import { getStrengthStepPreference } from "./settings.js";
 
 export function addLorasWidget(node, name, opts, callback) {
   ensureLmStyles();
@@ -416,7 +417,7 @@ export function addLorasWidget(node, name, opts, callback) {
         const loraIndex = lorasData.findIndex(l => l.name === name);
         
         if (loraIndex >= 0) {
-          lorasData[loraIndex].strength = (parseFloat(lorasData[loraIndex].strength) - 0.05).toFixed(2);
+          lorasData[loraIndex].strength = (parseFloat(lorasData[loraIndex].strength) - getStrengthStepPreference()).toFixed(2);
           // Sync clipStrength if collapsed
           syncClipStrengthIfCollapsed(lorasData[loraIndex]);
           
@@ -488,7 +489,7 @@ export function addLorasWidget(node, name, opts, callback) {
         const loraIndex = lorasData.findIndex(l => l.name === name);
         
         if (loraIndex >= 0) {
-          lorasData[loraIndex].strength = (parseFloat(lorasData[loraIndex].strength) + 0.05).toFixed(2);
+          lorasData[loraIndex].strength = (parseFloat(lorasData[loraIndex].strength) + getStrengthStepPreference()).toFixed(2);
           // Sync clipStrength if collapsed
           syncClipStrengthIfCollapsed(lorasData[loraIndex]);
           
@@ -541,7 +542,7 @@ export function addLorasWidget(node, name, opts, callback) {
           const loraIndex = lorasData.findIndex(l => l.name === name);
           
           if (loraIndex >= 0) {
-            lorasData[loraIndex].clipStrength = (parseFloat(lorasData[loraIndex].clipStrength) - 0.05).toFixed(2);
+            lorasData[loraIndex].clipStrength = (parseFloat(lorasData[loraIndex].clipStrength) - getStrengthStepPreference()).toFixed(2);
             
             const newValue = formatLoraValue(lorasData);
             updateWidgetValue(newValue);
@@ -611,7 +612,7 @@ export function addLorasWidget(node, name, opts, callback) {
           const loraIndex = lorasData.findIndex(l => l.name === name);
           
           if (loraIndex >= 0) {
-            lorasData[loraIndex].clipStrength = (parseFloat(lorasData[loraIndex].clipStrength) + 0.05).toFixed(2);
+            lorasData[loraIndex].clipStrength = (parseFloat(lorasData[loraIndex].clipStrength) + getStrengthStepPreference()).toFixed(2);
             
             const newValue = formatLoraValue(lorasData);
             updateWidgetValue(newValue);

web/comfyui/settings.js

@@ -24,6 +24,9 @@ const NEW_TAB_TEMPLATE_DEFAULT = "Default";
 
 const NEW_TAB_ZOOM_LEVEL = 0.8;
 
+const STRENGTH_STEP_SETTING_ID = "loramanager.strength_step";
+const STRENGTH_STEP_DEFAULT = 0.05;
+
 // ============================================================================
 // Helper Functions
 // ============================================================================
@@ -232,6 +235,32 @@ const getNewTabTemplatePreference = (() => {
     };
 })();
 
+const getStrengthStepPreference = (() => {
+    let settingsUnavailableLogged = false;
+
+    return () => {
+        const settingManager = app?.extensionManager?.setting;
+        if (!settingManager || typeof settingManager.get !== "function") {
+            if (!settingsUnavailableLogged) {
+                console.warn("LoRA Manager: settings API unavailable, using default strength step.");
+                settingsUnavailableLogged = true;
+            }
+            return STRENGTH_STEP_DEFAULT;
+        }
+
+        try {
+            const value = settingManager.get(STRENGTH_STEP_SETTING_ID);
+            return value ?? STRENGTH_STEP_DEFAULT;
+        } catch (error) {
+            if (!settingsUnavailableLogged) {
+                console.warn("LoRA Manager: unable to read strength step setting, using default.", error);
+                settingsUnavailableLogged = true;
+            }
+            return STRENGTH_STEP_DEFAULT;
+        }
+    };
+})();
+
 // ============================================================================
 // Register Extension with All Settings
 // ============================================================================
@@ -293,6 +322,19 @@ app.registerExtension({
             tooltip: "Choose a template workflow to load when creating a new workflow tab. 'Default (Blank)' keeps ComfyUI's original blank workflow behavior.",
             category: ["LoRA Manager", "Workflow", "New Tab Template"],
         },
+        {
+            id: STRENGTH_STEP_SETTING_ID,
+            name: "Strength Adjustment Step",
+            type: "slider",
+            attrs: {
+                min: 0.01,
+                max: 0.1,
+                step: 0.01,
+            },
+            defaultValue: STRENGTH_STEP_DEFAULT,
+            tooltip: "Step size for adjusting LoRA strength via arrow buttons or keyboard (default: 0.05)",
+            category: ["LoRA Manager", "LoRA Widget", "Strength Step"],
+        },
     ],
     async setup() {
         await loadWorkflowOptions();
@@ -375,4 +417,5 @@ export {
     getTagSpaceReplacementPreference,
     getUsageStatisticsPreference,
     getNewTabTemplatePreference,
+    getStrengthStepPreference,
 };