v0.19.0 — editable pump timer + device model picker

[0.19.0] - 2026-07-02

Full pump-timer editing + choose your device models.

Added

• Editable pump schedule: the Tuya pump's internal timer program now gets
  the same editors as the chlorinator — one on/off switch per slot, start
  times (slots 2-7) and durations, all writing skdl_filter through the
  cloud. The write path was live-verified on an SX2100 (round-trip, no-op
  write, field change + readback, restore) before shipping.
• Model selection: the sensor/salt/pump setup and reconfigure steps offer
  an optional model picker (suggestions + free text). The chosen model is
  shown on the device page instead of the generic fallback.