SudForecastPlot.show_dynamic()'s dashed "remaining" line was still
using the naive abs(delta)/rate estimate even after a run started,
even though the (much more accurate) server-side
SudForecastEstimator was already available - the static forecast got
the upgrade, the live one didn't.
tasks/sud.py: SudTask now recomputes a forecast for just the remaining
steps (seeded from the live current temperature) on every step change
and sends it as {'RemainingForecast': {...}}. Building the synthetic
"rest of this step" entry for a step currently HOLDING needs to keep
the current step's grain_mass/water_mass/temperature/etc - a bare
{'hold': {...}} re-resolves those to None against the synthetic doc's
empty default.step, breaking derive_plant_params() (caught live: a
TypeError on every step change, silently swallowed by asyncio).
client/brewpi_gui.py: on_plot_timer() now uses the server's
RemainingForecast for the dashed projection whenever available,
falling back to the naive estimate only for the brief window before
each step's recomputation arrives. show_dynamic() takes the already-
computed (t_rem, theta_rem) instead of computing it internally, so the
GUI/server sources are interchangeable from its point of view.
jens
d91bba1ba2