feat(maestro): Enter submits the spawn form from any field (#97)

A project-box or worktree-choice picker button that isn't yet the
active pick takes the Enter to choose it instead; the next Enter, once
it's active, submits. The project filter resolves to the top filtered
project rather than sending whatever cwd was last set. The raw-cwd
autocomplete's own Enter (accept the highlight) keeps working via
e.defaultPrevented.

web/src/spawnForm.ts

@@ -549,11 +549,15 @@ export function createSpawnForm(opts: SpawnFormOptions): SpawnFormHandle {
     if (match) selectPreset(match.id);
   }
 
+  /** Groups with at least one member (itself or a worktree) matching `query`. */
+  function visibleGroups(query: string): ProjectGroup[] {
+    return groups.filter((g) => filterProjects([g.main, ...g.worktrees], query).length > 0);
+  }
+
   function renderProjects(): void {
     projectsEl.replaceChildren();
     groups = groupProjects(sortProjects(discovered, new Date()));
-    const query = filterInput.value;
-    const visible = groups.filter((g) => filterProjects([g.main, ...g.worktrees], query).length > 0);
+    const visible = visibleGroups(filterInput.value);
     for (const group of visible) projectsEl.appendChild(projectBox(group));
     if (discovered.length > 0 && visible.length === 0) {
       const empty = document.createElement("p");
@@ -862,6 +866,34 @@ export function createSpawnForm(opts: SpawnFormOptions): SpawnFormHandle {
   // ---- live dir autocomplete on the raw cwd input (NAP-329) ------------
   const autocomplete = attachDirAutocomplete(cwdRaw);
 
+  // ---- Enter submits from anywhere (#97) --------------------------------
+  // A project-box/wt-choice that isn't yet the active pick takes the Enter to
+  // choose it instead; the next Enter, now that it's active, submits.
+  // dirAutocomplete's own Enter (accept the highlight) already preventDefaults
+  // when it handles the key, which the `e.defaultPrevented` guard defers to.
+  form.addEventListener("keydown", (e) => {
+    if (e.key !== "Enter" || e.defaultPrevented) return;
+    const target = e.target as HTMLElement;
+
+    if (target instanceof HTMLButtonElement) {
+      if (!target.classList.contains("project-box") && !target.classList.contains("wt-choice")) return;
+      e.preventDefault();
+      if (!target.classList.contains("is-active")) {
+        target.click();
+        return;
+      }
+      form.requestSubmit();
+      return;
+    }
+
+    e.preventDefault();
+    if (target === filterInput) {
+      const top = visibleGroups(filterInput.value)[0];
+      if (top && top.main.path !== selectedGroup?.main.path) selectProject(top);
+    }
+    form.requestSubmit();
+  });
+
   // ---- submit ----------------------------------------------------------
   form.addEventListener("submit", async (e) => {
     e.preventDefault();