The N3W SCH3DUL3 vertical form is gone. The schedules table now
carries an always-visible inline create row at the bottom — fill the
cells, click ＋ to POST /api/schedules, the new schedule appears
above on the next refresh.
Per-column inputs match the display semantics:
- `next` → `<input type="datetime-local">` (defaults to now+5min)
- `every` → 4 mini d/h/m/s number inputs (blank/all-zero = one-shot)
- `body` → `<textarea rows=1>` expanding to 4em on focus-within
so multi-line prompts still fit (closes mara's "prompt may still be
multi-line" requirement)
- per-agent columns → checkbox (whole cell clickable via padded label)
- actions → ＋ submit + ⌫ reset (clears the carry without POSTing)
`newScheduleCarry` module-scope object survives the paintAtomic
re-render so mid-typed values stick across schedule-list refreshes
(same pattern as `scheduleEditCarry` from #474).
H2 collapses from "N3W SCH3DUL3" + "QU3U3D SCH3DUL3S" down to a
single "SCH3DUL3S" since the section now does both. Empty-state
branch on `renderSchedulesList` is gone — the table always renders
because the create row is always there.
`#schedule-new-section` div + `renderScheduleNewForm` /
`readScheduleFormCarry` / `submitNewSchedule` and the
`.schedule-new-form` CSS selector all removed. The edit-form path
(#474 `renderScheduleEditForm` colspan'd row on `✎` toggle) is
unchanged — "edit mode is inline in the table" already shipped
there, this PR just adds the same mental model for create.
Validations match the old form: empty targets / empty body /
invalid datetime / non-integer interval each surface an `alert()`.
The ＋ button shows a spinner while the POST is in flight, then
clears the carry + triggers `refreshSchedules()`.
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