FlexMeasures / flexmeasures / 29918605411

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Show asset annotations in asset charts (#2312)

* feat: show asset annotations in asset charts

Asset (and account) annotations now appear in the asset chart as a lightly
shaded time band across all subcharts. Hovering the band darkens it in the
hovered subchart only, and shows a tooltip with the annotation text, type,
source and time window. Alert annotations get a warning hue; instant
(zero-duration) annotations render as a vertical rule with a top marker.

- New GET /api/v3_0/assets/<id>/chart_annotations endpoint (mirrors the
  sensor endpoint, includes account annotations)
- Annotation layers are injected per subchart of the vconcat chart, all
  bound to one shared named dataset, with per-subchart hover/select params
- The hover_x_brush/hover_nearest_brush selections ignore events on
  annotation marks (their datums lack the binned event_start field)
- graphs.html annotation fetching generalized to asset pages

Signed-off-by: F.N. Claessen <felix@seita.nl>
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LQFkeGxDwErydUV5ZmHmki

* docs: fill in PR link in changelog

Signed-off-by: F.N. Claessen <felix@seita.nl>
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LQFkeGxDwErydUV5ZmHmki

* feat: show annotation text below the hovered subchart, keep data tooltips

Rework of the annotation interaction after review:

- Annotation bands/rules/markers are now drawn behind the data layers,
  and no longer define their own tooltip, so the regular data tooltip
  keeps working everywhere, including inside annotation bands
- Hover/pin params capture the time (event_start) of the hovered/clicked
  datum; annotations highlight when that time falls inside their window
  (with a one-resolution-bin tolerance for instant annotations, which
  also makes the 1px rule easy to hover)
- On hover or click-to-pin, the annotation text is shown below the
  hovered su... (continued)

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