fix: hash long dedicated worker tags (#7914)

* fix: hash long dedicated worker tags

* Update frontend/src/lib/components/dedicated_worker.ts

Co-authored-by: claude[bot] <209825114+claude[bot]@users.noreply.github.com>

---------

Co-authored-by: claude[bot] <209825114+claude[bot]@users.noreply.github.com>

frontend/src/lib/components/dedicated_worker.ts

@@ -0,0 +1,41 @@
+const MAX_TAG_LEN = 50
+const HASH_SUFFIX_LEN = 16
+
+// IMPORTANT: This implementation must stay in sync with the Rust backend
+// `dedicated_worker_tag()` in backend/windmill-common/src/worker.rs.
+// The frontend version is used for display; the backend version is authoritative.
+export async function dedicatedWorkerTag(workspaceId: string, path: string): Promise<string> {
+	const fullTag = `${workspaceId}:${path}`
+	if (fullTag.length <= MAX_TAG_LEN) return fullTag
+
+	const encoded = new TextEncoder().encode(fullTag)
+	const hashBuffer = await crypto.subtle.digest('SHA-256', encoded)
+	const hashArray = Array.from(new Uint8Array(hashBuffer))
+	const hexHash = hashArray.map((b) => b.toString(16).padStart(2, '0')).join('')
+
+	const prefixLen = MAX_TAG_LEN - 1 - HASH_SUFFIX_LEN
+	return `${fullTag.substring(0, prefixLen)}#${hexHash.substring(0, HASH_SUFFIX_LEN)}`
+}
+
+export function parseTag(
+	tag: string
+): { workspace: string; type: 'script' | 'flow'; path: string } | null {
+	const colonIndex = tag.indexOf(':')
+	if (colonIndex === -1) return null
+
+	const workspace = tag.substring(0, colonIndex)
+	const rest = tag.substring(colonIndex + 1)
+
+	if (rest.startsWith('flow/')) {
+		return { workspace, type: 'flow', path: rest.substring(5) }
+	} else {
+		return { workspace, type: 'script', path: rest }
+	}
+}
+
+export async function computeHashedTag(rawTag: string): Promise<string> {
+	const parsed = parseTag(rawTag)
+	if (!parsed) return rawTag
+	const fullPath = parsed.type === 'flow' ? `flow/${parsed.path}` : parsed.path
+	return dedicatedWorkerTag(parsed.workspace, fullPath)
+}