feat(maestro): one-word handles, quieter project boxes

Session handles are one word from a single 218-entry list — instruments,
forms, notation and theory, tempo and dynamics — replacing the
adjective-noun pair. A batch is shuffled, so it repeats only once the
wordlist runs out.

Project boxes show the parent directory instead of the full path: the
last segment is already the name line above it. The last command is gone
from the box, and picking a project no longer pre-selects it — the
directory and what runs in it are independent choices. Both changes land
in the TUI picker too, which mirrors the web form's rules.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

web/src/spawnFormNames.test.ts

@@ -3,8 +3,8 @@ import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 
 import { createSpawnForm, type SpawnFormHandle } from "./spawnForm.js";
 
-const BATCH_A = ["allegro-cello", "presto-fugue", "adagio-lyre"];
-const BATCH_B = ["forte-oboe", "largo-tuba", "vivace-harp"];
+const BATCH_A = ["cello", "fugue", "lyre"];
+const BATCH_B = ["oboe", "tuba", "harp"];
 
 /** Stub the three fetches the form's initial load makes. Records every
  * /api/names URL so tests can assert how many batches were fetched. */