feat: add reset-to-default for widget parameters in right side panel (#8861)

## Summary

Add per-widget and reset-all-parameters functionality to the right side
panel, allowing users to quickly revert widget values to their defaults.

## Changes

- **What**: Per-widget "Reset to default" option in the WidgetActions
overflow menu, plus a "Reset all parameters" button in each
SectionWidgets header. Defaults are derived from the InputSpec (explicit
default, then type-specific fallbacks: 0 for INT/FLOAT, false for
BOOLEAN, empty string for STRING, first option for COMBO).
- **Dependencies**: Builds on #8594 (WidgetValueStore) for reactive UI
updates after reset.

## Review Focus

- `getWidgetDefaultValue` fallback logic in `src/utils/widgetUtil.ts` —
are the type-specific defaults appropriate?
- Deep equality check (`isEqual`) for disabling the reset button when
the value already matches the default.
- Event flow: WidgetActions emits `resetToDefault` → WidgetItem forwards
→ SectionWidgets handles via `writeWidgetValue` (sets value, triggers
callback, marks canvas dirty).

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8861-feat-add-reset-to-default-for-widget-parameters-in-right-side-panel-3076d73d365081d1aa08d5b965a16cf4)
by [Unito](https://www.unito.io)

Co-authored-by: Terry Jia <terryjia88@gmail.com>

src/components/rightSidePanel/parameters/SectionWidgets.vue

@@ -12,6 +12,9 @@ import type {
 } from '@/lib/litegraph/src/litegraph'
 import type { IBaseWidget } from '@/lib/litegraph/src/types/widgets'
 import { useCanvasStore } from '@/renderer/core/canvas/canvasStore'
+import { useNodeDefStore } from '@/stores/nodeDefStore'
+import { getWidgetDefaultValue } from '@/utils/widgetUtil'
+import type { WidgetValue } from '@/utils/widgetUtil'
 
 import PropertiesAccordionItem from '../layout/PropertiesAccordionItem.vue'
 import { HideLayoutFieldKey } from '@/types/widgetTypes'
@@ -57,6 +60,7 @@ watchEffect(() => (widgets.value = widgetsProp))
 provide(HideLayoutFieldKey, true)
 
 const canvasStore = useCanvasStore()
+const nodeDefStore = useNodeDefStore()
 const { t } = useI18n()
 
 const getNodeParentGroup = inject(GetNodeParentGroupKey, null)
@@ -118,15 +122,31 @@ function handleLocateNode() {
   }
 }
 
-function handleWidgetValueUpdate(
-  widget: IBaseWidget,
-  newValue: string | number | boolean | object
-) {
-  widget.value = newValue
-  widget.callback?.(newValue)
+function writeWidgetValue(widget: IBaseWidget, value: WidgetValue) {
+  widget.value = value
+  widget.callback?.(value)
   canvasStore.canvas?.setDirty(true, true)
 }
 
+function handleResetAllWidgets() {
+  for (const { widget, node: widgetNode } of widgetsProp) {
+    const spec = nodeDefStore.getInputSpecForWidget(widgetNode, widget.name)
+    const defaultValue = getWidgetDefaultValue(spec)
+    if (defaultValue !== undefined) {
+      writeWidgetValue(widget, defaultValue)
+    }
+  }
+}
+
+function handleWidgetValueUpdate(widget: IBaseWidget, newValue: WidgetValue) {
+  if (newValue === undefined) return
+  writeWidgetValue(widget, newValue)
+}
+
+function handleWidgetReset(widget: IBaseWidget, newValue: WidgetValue) {
+  writeWidgetValue(widget, newValue)
+}
+
 defineExpose({
   widgetsContainer,
   rootElement
@@ -157,6 +177,17 @@ defineExpose({
               {{ parentGroup.title }}
             </span>
           </span>
+          <Button
+            v-if="!isEmpty"
+            variant="textonly"
+            size="icon-sm"
+            class="subbutton shrink-0 size-8 cursor-pointer text-muted-foreground hover:text-base-foreground"
+            :title="t('rightSidePanel.resetAllParameters')"
+            :aria-label="t('rightSidePanel.resetAllParameters')"
+            @click.stop="handleResetAllWidgets"
+          >
+            <i class="icon-[lucide--rotate-ccw] size-4" />
+          </Button>
           <Button
             v-if="canShowLocateButton"
             variant="textonly"
@@ -189,6 +220,7 @@ defineExpose({
             :parents="parents"
             :is-shown-on-parents="isWidgetShownOnParents(node, widget)"
             @update:widget-value="handleWidgetValueUpdate(widget, $event)"
+            @reset-to-default="handleWidgetReset(widget, $event)"
           />
         </TransitionGroup>
       </div>