feat(vault): add "Correct transcription" Cantemo action button

Adds a permission-gated chip to the Vault item actions (and the embedded
cantemo panel) that opens the transcription editor for the item at
/transcription/<vxid> in a new tab. Gated by the existing transcription
permission (admin or mediabanken), matching the home-page Transcription
tool. Adds openToolWithIdPath since the editor takes the id as a path
segment rather than the ?id= query the export chips use.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: KillerX

frontend/app/composables/useCantemoActions.ts

@@ -53,6 +53,14 @@ export function useCantemoActions(vxId: MaybeRefOrGetter<string | undefined>) {
         window.open(`${path}?id=${id}`, "_blank");
     }
 
+    // Like openTool, but for tools that take the item id as a path segment
+    // (e.g. the transcription editor at /transcription/<vxid>) rather than ?id=.
+    function openToolWithIdPath(path: string) {
+        const id = toValue(vxId);
+        if (!id) return;
+        window.open(`${path}/${id}`, "_blank");
+    }
+
     const chips = computed<CantemoChip[]>(() => {
         const m = me.value;
         return [
@@ -105,6 +113,18 @@ export function useCantemoActions(vxId: MaybeRefOrGetter<string | undefined>) {
                         "Transcription started",
                     ),
             },
+            {
+                name: "Correct transcription",
+                action: "Open the transcription editor",
+                color: "#8b5cf6",
+                enabled: !!(
+                    m?.admin ||
+                    (m?.transcription &&
+                        (m.transcription.admin ||
+                            m.transcription.mediabanken))
+                ),
+                run: () => openToolWithIdPath("/transcription"),
+            },
             {
                 name: "Update subtitle from Subtrans",
                 action: "Trigger appropriate workflow",