fix: respect disabled fields in JSON input mode (#8663)

* fix: respect disabled fields in JSON input mode

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: guard against undefined default in disabled field enforcement

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: show toast when disabled fields are reset to defaults on run

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/lib/components/RunForm.svelte

@@ -38,7 +38,10 @@
 	export async function run(overrideScheduledForStr?: string | undefined | null) {
 		let processedArgs: Record<string, any>
 		try {
-			processedArgs = await processSecretArgs(args ?? {}, runnable?.schema)
+			processedArgs = await processSecretArgs(
+				enforceDisabledDefaults(args ?? {}, true),
+				runnable?.schema
+			)
 		} catch (e) {
 			sendUserToast('Failed to process sensitive args: ' + e, true)
 			return
@@ -132,6 +135,30 @@
 		}
 	}
 
+	function enforceDisabledDefaults(
+		args: Record<string, any>,
+		notify: boolean = false
+	): Record<string, any> {
+		const schema = runnable?.schema
+		if (!schema?.properties) return args
+		const result = { ...args }
+		const resetKeys: string[] = []
+		for (const [key, prop] of Object.entries(schema.properties) as [string, any][]) {
+			if (prop?.disabled && 'default' in prop) {
+				if (notify && result[key] !== prop.default) {
+					resetKeys.push(key)
+				}
+				result[key] = prop.default
+			}
+		}
+		if (resetKeys.length > 0) {
+			sendUserToast(
+				`Disabled field${resetKeys.length > 1 ? 's' : ''} ${resetKeys.map((k) => `'${k}'`).join(', ')} reset to default value${resetKeys.length > 1 ? 's' : ''}`
+			)
+		}
+		return result
+	}
+
 	export function setCode(code: string) {
 		jsonEditor?.setCode(code)
 	}
@@ -249,7 +276,7 @@
 					bind:this={jsonEditor}
 					on:select={(e) => {
 						if (e.detail) {
-							args = e.detail
+							args = enforceDisabledDefaults(e.detail)
 						}
 					}}
 					updateOnBlur={false}