fix(browser): accept targetId prefixes

src/browser/target-id.ts

@@ -0,0 +1,24 @@
+export type TargetIdResolution =
+  | { ok: true; targetId: string }
+  | { ok: false; reason: "not_found" | "ambiguous"; matches?: string[] };
+
+export function resolveTargetIdFromTabs(
+  input: string,
+  tabs: Array<{ targetId: string }>,
+): TargetIdResolution {
+  const needle = input.trim();
+  if (!needle) return { ok: false, reason: "not_found" };
+
+  const exact = tabs.find((t) => t.targetId === needle);
+  if (exact) return { ok: true, targetId: exact.targetId };
+
+  const lower = needle.toLowerCase();
+  const matches = tabs
+    .map((t) => t.targetId)
+    .filter((id) => id.toLowerCase().startsWith(lower));
+
+  const only = matches.length === 1 ? matches[0] : undefined;
+  if (only) return { ok: true, targetId: only };
+  if (matches.length === 0) return { ok: false, reason: "not_found" };
+  return { ok: false, reason: "ambiguous", matches };
+}