fix(sessions): hand back the PowerShell common parameters too

`RunForm` keeps `_wm_ps_*` out of `args` and puts them back only as it submits,
so handing `args` to the card dropped whatever the reader had chosen on the
page — ErrorAction among them, which falls back to Stop. The form now answers
with what a run would send.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

frontend/src/lib/components/RunForm.svelte

@@ -65,6 +65,13 @@
 		return { scriptArgs, commonParams }
 	}
 
+	/** Everything the form is holding, as a run would send it: the schema's arguments and the
+	 * PowerShell common parameters, which are kept apart from them in here and only put back
+	 * on the way out. For a caller handing the form's contents somewhere else. */
+	export function heldArgs(): Record<string, any> {
+		return { ...args, ...psCommonParams }
+	}
+
 	export async function setArgs(nargs: Record<string, any>) {
 		const { scriptArgs, commonParams } = extractPsCommonParams(nargs)
 		args = scriptArgs

frontend/src/lib/components/details/FlowDetail.svelte

@@ -400,7 +400,7 @@
 	// tab closed while the item is still being fetched would otherwise hand the card an empty
 	// object and wipe the proposal it is still parked on.
 	onDestroy(() => {
-		if (args !== undefined) pendingRun?.handBack(args)
+		if (args !== undefined) pendingRun?.handBack(runForm?.heldArgs() ?? args)
 	})
 
 	// The dev workspace's editor is not one the session panel can host, so from a preview tab

frontend/src/lib/components/details/ScriptDetail.svelte

@@ -449,7 +449,7 @@
 	// tab closed while the item is still being fetched would otherwise hand the card an empty
 	// object and wipe the proposal it is still parked on.
 	onDestroy(() => {
-		if (args !== undefined) pendingRun?.handBack(args)
+		if (args !== undefined) pendingRun?.handBack(runForm?.heldArgs() ?? args)
 	})
 
 	// Read once on purpose: these args seed the form, so tracking the fragment would