web: convert Daily entry to MUI — field-first phone

Part of #674. Direction B's whole point: the hen-house phone is primary.

One task per screen, glove-sized targets; desktop is the same parts wider.

This is the screen a worker uses standing in a shed, so it is the one where MUI's touch targets,
focus handling and form controls have to earn their place. Convert after the Dashboard slice on this
epic so the layout conventions are already settled.

Before/after screenshots at 1280 and 390, per the epic's capture rules.

Note the interaction with #740 — the phone action bar cannot hold its own button labels at 390px,
because .actions button is flex: 1 and the label wraps to three lines inside a
border-radius: 999px pill that resolves to an ellipse. If this slice restyles action buttons with
MUI, say explicitly whether it closes #740 or leaves it.