feat(web): structured schedule create/edit UI

Replace the read-only schedule list with a form-driven builder so users
never hand-edit cron patterns. A canonical ScheduleFormState feeds two
inverse pure functions (toCron / fromCron) that guarantee round-trip
equivalence, so new and edit flows share the exact same UI state shape
even though the DB stores only the pattern. Unrecognised patterns (AI-
generated ranges/steps, descriptors, 6-field seconds cron) fall back
losslessly to an advanced mode instead of being silently rewritten.

The dialog adds live previews (human-readable via cronstrue, next 3
trigger times via cron-parser evaluated in the bot timezone) and row
actions for edit / enable-toggle / delete.

vitest.config.ts

@@ -8,6 +8,7 @@ export default defineConfig({
     globals: true,
     include: [
       'packages/**/*.test.ts',
+      'apps/**/*.test.ts',
     ],
     env: process.env,
     testTimeout: Infinity,