feat(ev): show the ready time on the household clock

[frahlg]

Problem

The app shows the car's ready time by turning the box's time_of_day_min_utc into a clock time with today's offset in the phone's zone. A phone abroad shows and saves the wrong time at home. srcfl/ftw#1586 adds time_of_day_min, the ready time on the household clock.

Change

• toLoadpoint reads time_of_day_min into schedule.timeOfDayMin when it is present and in range; null from an older box.
• readyClock and readyInput show the household minute as it is. Without it they fall back to localClock and utcMinutesToLocalInput, as before.
• The EvPanel save sends time_of_day_min and time_of_day_min_utc. A box with feat(api): send the EV ready time on the household clock ftw#1586 uses the first; an older box reads the second, as today.
• The sim keeps the household clock as the box does: it serves both fields, the household minute wins on PUT, and a value out of range gets 400.
• The comment on localInputToUtcMinutes said a DST change moves the deadline. That stopped being true with fix(loadpoint): keep the EV ready time on the household clock ftw#1582; the comment now says what the UTC minute is for.

Paired with srcfl/ftw#1586. Either side can merge first: this app against an older box sends the UTC minute it always sent, and an older app against the new box is an old client the box still serves.

contract/registry.yaml does not change. Fields of HTTP bodies are not registry names; time_of_day_min_utc is not there either.

Evidence

• npm run verify passes: 1062 tests, svelte-check and build.
• src/lib/format/ev.test.ts, src/views/EvPanel.svelte.test.ts and tests/api-passthrough.test.ts pass with TZ set to Europe/Stockholm, America/New_York and Asia/Kolkata.
• Browser review in the dev sim at phone size: the goal reads "84 % Ready by 07:00 AM · every day"; setting 06:30 in Change goal saved it and the sentence read "06:30 AM" after the reread. The sim runs in the browser's zone, so this review shows the save path, not a second zone; the zone cases are in the tests above and in the box review in feat(api): send the EV ready time on the household clock ftw#1586.

🤖 Generated with Claude Code

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-12T15:23:49.031303Z	d506a84	PR opened

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