fix: look up a script's head at its row path, and show flow and app version ids bare

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

frontend/src/lib/components/ScriptBuilder.svelte

@@ -559,10 +559,13 @@
 
 		try {
 			if (initialPath && initialPath != '') {
+				// The row's path, not `initialPath`: that is the typed path, where a
+				// staged rename has nothing deployed, and a missing head would deploy
+				// on a base that already has a child.
 				actual_parent_hash = (
 					await ScriptService.getScriptLatestVersion({
 						workspace: opWorkspace!,
-						path: initialPath
+						path: userDraftPath || initialPath
 					})
 				)?.script_hash
 			}

frontend/src/lib/components/common/confirmationModal/StaleDraftModal.svelte

@@ -58,7 +58,7 @@
 	// Scripts are versioned by hash, the other kinds by a numeric version id;
 	// the diff picker renders them the same way.
 	function formatVersion(v: string): string {
-		return itemKind === 'script' ? v.slice(0, 8) : `v${v}`
+		return itemKind === 'script' ? v.slice(0, 8) : v
 	}
 
 	async function loadLatestDeploy() {