feat(web): show car charge levels and upcoming charging in the site plan

[frahlg]

A charging goal should show what FTW knows about the car and when it plans to charge. This adds a “Car’s charge limit” goal, shows the current battery level and car limit with their sources, and adds readable charging windows to the car view, Overview and the household Plan.

Existing percentage goals keep their values. The new goal choice requires Core’s vehicle_limit_goal_supported flag from merged #1297. The car-limit goal uses only Core’s goal_complete for completion; a 100% planning fallback or estimated level never confirms it. Charge now still sends a manual hold without a percentage release cap.

The level display reads fresh vehicle_soc and vehicle_charge_limit separately from the controller’s current_soc estimate. When car data is missing, users can correct the current estimate and see that the car limit is unknown. There is no manual car-limit hint in Core yet; this UI does not invent one or reuse schedule.soc for it. Pending writes, restart persistence failures and unavailable readings remain visible.

The shared timeline shows upcoming windows, local dates, and planned energy. Pending, outdated, paused, manual and unavailable states do not display old windows as a current schedule. Energy clipped to the visible period is marked approximate. The household chart and briefing now sum loadpoint_power_w across cars, falling back to loadpoint_w for older plans without counting both.

Validation: 638 web tests pass; make verify passes. Rendered car and household-plan views were checked with labeled local sample data, including mobile at 390 px, desktop, light/dark themes, missing car data, pending plans, current-level editing and percentage-goal preservation. The corrected preview includes the whole car plan view. No physical charging or box install was performed.

Draft while Fredrik reviews the revised UI. Core #1297 and storage #1300 are already on this branch’s base. Related EV work: #1293. The visibility polling code from open #1177 is preserved; these changes extend its existing fetch batch and plan rendering. Index edits are confined to plan content and do not alter the map assets from #1219 or settings asset from #1003.

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-17T16:53:48.026993Z	0f5a123	Draft marked ready

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