EasyIQ Ugeplan: port to skoleportal.easyiqcloud.dk + widget 0128

[spraot]

Summary

• Replaces the old api.easyiqcloud.dk/api/aula/weekplaninfo POST flow with the skoleportal.easyiqcloud.dk AuthenticateAulaUser + Calendar/CalendarGetWeekplanEvents flow that Aula's web UI itself uses.
• Adds widget 0128 ("EasyIQ Ugeplan") to the EasyIQ detection alongside the legacy 0001; whichever the user has provisioned routes through the same code path.
• Turns the silent except KeyError: _LOGGER.debug("None") into a WARNING that names the missing key and the response keys it did see, and surfaces non-200 / non-JSON responses at WARNING level too — future schema regressions stay visible at default log level instead of disappearing into a debug("None") haystack.

Why

For a school whose Aula widget list contains 0128 but not 0001, the integration was rendering only <h2> Uge NN</h2> for every child. Debug logging showed every call to api.easyiqcloud.dk/api/aula/weekplaninfo returning:

{"ErrorCode": "1", "ErrorDescription": "Institutionen har ikke licens til EasyIQ Ugeplan widget."}

— for all institutionFilter values, even though the Ugeplan widget itself renders populated content in the Aula UI for the same user. Capturing the live web app traffic in a HAR confirmed the UI never hits api.easyiqcloud.dk at all. It uses a different host with a different auth model:

POST https://skoleportal.easyiqcloud.dk/Aula/AuthenticateAulaUser
     (empty body, Content-Length: 0) -> {"loginId": ..., "child": ..., ...}
GET  https://skoleportal.easyiqcloud.dk/Calendar/CalendarGetWeekplanEvents
     ?loginId=<id>&date=<Monday-of-week, ISO>&activityFilter=-1
     &courseFilter=-1&textFilter=&ownWeekPlan=false

Auth on every skoleportal call (no csrfp-token, no cookies once these are right):

Authorization: Bearer <aulaToken.getAulaToken token, widgetId=0001 or 0128>
X-Login: <parent uniLogin>
X-InstitutionFilter: <comma-separated institution codes>
X-UserProfile: guardian
X-ChildFilter: <comma-separated child uniLogins>
X-Child: <current child uniLogin>
X-Requested-With: Fetch

A realistic User-Agent is required — Cloudflare drops requests without one.

Returned events use StartTime / EndTime already in %Y/%m/%d %H:%M, plus CoursesDisplay (subject name) and Description (HTML body), so the rendered HTML carries over with just field-name swaps. ISO-week → Monday conversion uses datetime.date.fromisocalendar(year, week, 1).

Test plan

• Three children across two institutions, widget 0128 only: ugeplan and ugeplan_next sensor attributes now render the full HTML body (Mandag 08:00- 08:45 / Musik / <description> …) instead of the empty <h2> header.
• Verified EasyIQ result for <child> week <YYYY-WNN> (<N> events) debug lines on each coordinator refresh.
• Not tested against a user with the legacy widget 0001; auth shape is the same and the token API call passes the widget id through, so it should work, but a second pair of eyes from someone still on 0001 would be ideal.
• Not tested with a guardian whose children are split across schools where only some are on EasyIQ — the per-child loop will warn and continue on the ones that don't authenticate, leaving others intact.

Notes for review

• The bare except KeyError removed in this PR was the root cause of how long this took to diagnose for me — it would silently swallow the EasyIQ license error and render an empty header. Even if the host change is contentious, the louder error handling stands on its own.
• EASYIQ_API constant in const.py is now unused inside client.py but I left it in place to avoid breaking anyone importing it; happy to drop in a follow-up if you'd prefer.

[spraot]

Closing in favour of #352, which lands the same SkolePortal port with a cleaner shape: purely additive (separate if "0128" block, doesn't touch the legacy 0001 path), module-level helpers that make the flow easier to review and reuse, native <details>/<summary> per-day rendering, and html.unescape() so Danish characters render correctly. I didn't notice #352 was already open when I sent this — apologies for the duplicate.

The one delta worth preserving — louder error handling around the silent except KeyError: _LOGGER.debug("None") in the legacy 0001 block — I've left as a comment on #352 (#352 (comment)) for the author/maintainer to fold in if useful.