feat(maestro): web spawn form stops naming sessions

The name field starts empty and the reroll is gone; the worktree branch keeps
a default by borrowing one handle from /api/names. A card whose name the
daemon generated renders dimmed until a first prompt settles it.

Refs #131

web/src/spawnForm.ts

@@ -142,8 +142,8 @@ export function createSpawnForm(opts: SpawnFormOptions): SpawnFormHandle {
     <div class="field">
       <span class="field-label">Name</span>
       <div class="name-row">
-        <input name="name" type="text" autocomplete="off" />
-        <button type="button" class="btn btn-icon reroll" aria-label="Generate a new name" title="New name">↻</button>
+        <input name="name" type="text" autocomplete="off"
+               placeholder="named after your first prompt" />
       </div>
     </div>
     <fieldset class="worktree">
@@ -257,57 +257,26 @@ export function createSpawnForm(opts: SpawnFormOptions): SpawnFormHandle {
   };
 
   // ---- name (also seeds the worktree branch) ---------------------------
-  // The worktree branch defaults to the session name — including a clone's
-  // prefilled name — and tracks it on reroll/edit until the user types their
-  // own branch. Only in "new" mode: an existing-branch pick is not a name.
+  // The field starts empty (#131): a session the operator does not name is
+  // named by the daemon — a provisional handle at spawn, replaced by one
+  // derived from the first prompt. Typing here opts out of all of that, and
+  // still seeds the worktree branch as it always did.
   // True only once the operator types their own branch. It cannot be inferred
   // from the seed: in "new" mode `emit()` publishes the auto-synced session
   // name, so seeding from it froze the branch after any form rebuild
   // (#67 review). `worktreeBranchEdited` is carried explicitly instead.
   let branchEdited = Boolean(prefill.worktreeBranchEdited);
+  // A cleared name leaves the branch on its last value rather than blanking
+  // it: the branch still has to be something, and the session name no longer
+  // has to be anything.
   const syncBranchToName = () => {
-    if (!branchEdited && branchMode === "new") branchInput.value = nameInput.value;
-  };
-  // Handles come from `GET /api/names` in batches (#53): the first one seeds
-  // the field, rerolls consume the rest locally so they stay instant, and a
-  // new batch is fetched when (and only when) the queue runs dry. One refill
-  // at a time keeps rapid rerolls from storming the daemon.
-  const NAME_BATCH_SIZE = 20;
-  let nameQueue: string[] = [];
-  let nameFetch: Promise<void> | null = null;
-  // Guards against a late batch clobbering something the operator already
-  // typed or rerolled.
-  let nameTouched = Boolean(prefill.name);
-  const refillNames = (): Promise<void> => {
-    if (!nameFetch) {
-      nameFetch = fetchNames(NAME_BATCH_SIZE)
-        .then((batch) => {
-          if (!destroyed) nameQueue.push(...batch.names);
-        })
-        .catch(() => {
-          /* reroll just stays on the current name */
-        })
-        .finally(() => {
-          nameFetch = null;
-        });
+    if (!branchEdited && branchMode === "new" && nameInput.value) {
+      branchInput.value = nameInput.value;
     }
-    return nameFetch;
   };
 
   nameInput.value = prefill.name ?? "";
-  if (!nameTouched) {
-    void refillNames().then(() => {
-      if (destroyed || nameTouched || nameInput.value) return;
-      const next = nameQueue.shift();
-      if (next !== undefined) {
-        nameInput.value = next;
-        syncBranchToName();
-        emit();
-      }
-    });
-  }
   nameInput.addEventListener("input", () => {
-    nameTouched = true;
     syncBranchToName();
     emit();
   });
@@ -315,24 +284,23 @@ export function createSpawnForm(opts: SpawnFormOptions): SpawnFormHandle {
     branchEdited = true;
     emit();
   });
-  (form.querySelector(".reroll") as HTMLButtonElement).addEventListener("click", () => {
-    nameTouched = true;
-    const apply = () => {
-      if (destroyed) return;
-      const next = nameQueue.shift();
-      if (next === undefined) return;
-      nameInput.value = next;
-      syncBranchToName();
-      emit();
-    };
-    // Only hit the daemon when the local batch is exhausted.
-    if (nameQueue.length === 0) {
-      void refillNames().then(apply);
-    } else {
-      apply();
-    }
-  });
-  syncBranchToName(); // seed the branch from the initial name
+  syncBranchToName(); // seed the branch from a clone's prefilled name
+  // The branch field still needs a default, and the name field no longer
+  // provides one, so an unnamed spawn borrows one handle from `GET /api/names`
+  // (#53) for the branch alone.
+  if (!branchInput.value && !branchEdited && branchMode === "new") {
+    void fetchNames(1)
+      .then((batch) => {
+        const handle = batch.names[0];
+        if (destroyed || !handle) return;
+        if (branchInput.value || branchEdited || branchMode !== "new") return;
+        branchInput.value = handle;
+        emit();
+      })
+      .catch(() => {
+        /* the operator types their own branch */
+      });
+  }
 
   // ---- command tiles ---------------------------------------------------
   // `focus` is false for the two initial applications (construction, and again