feat(web): simple forecast status with details on demand

[frahlg]

The ML twins panel mixed Energyplan learning state with older model statistics and quality bars. More now shows two simple forecast cards with a status, elapsed learning days when a recorded start exists, and a Details button. The cards are available in simple mode, above Advanced.

Details contains model state, training dates, the household profile, explained local-model statistics and relearning. The view removes the training-quality percentage bars. Disclosure state and keyboard focus survive refreshes; polling runs only while More and the browser tab are visible.

Healthy requires learning.health: healthy, a ready model and a valid recent training timestamp. Degraded health takes priority. Missing health fields produce a neutral Ready state; a missing start date produces no day count. Paired backend: #1283 supplies learning.health and learning.health_reason, including storage failures; it currently depends on #1282. This UI handles older servers without those fields. Health reports operation, not measured forecast accuracy.

Validation:

• All 610 web tests pass, including disclosure/focus, age, health, stale data, polling and reset failure cases.
• PATH=/opt/homebrew/bin:$PATH make verify passes with the installed modern Bash.
• Rendered the cards at desktop and 390 px width, in dark/light themes, with details, degraded health and missing start/health data. Also checked the actual More layout in simple mode. Preview uses fixtures and cannot send device commands.

Fredrik reviewed the rendered preview and approved merging on 2026-09-17. Local preview: http://127.0.0.1:8196/#more (sample data). No box deployment.

Related: #1177 touches polling in twins.js; its twins.js version is identical to master at this PR's base. This change retains hidden-tab suspension and further limits polling to More.

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-17T07:27:27.686118Z	c3aeff2	Draft marked ready

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