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feat: use ECharts to have faster charts  (and more interactive) (#2234)

* feat: use ECharts to make the asset charts faster and more interactive

Signed-off-by: Ahmad-Wahid <ahmedwahid16101@gmail.com>

* feat: use ECharts to make the asset charts faster and more interactive

Signed-off-by: Ahmad-Wahid <ahmedwahid16101@gmail.com>

* add changelog

Signed-off-by: Ahmad-Wahid <ahmedwahid16101@gmail.com>

* improve the EChart by adding missing features as we have in the existing charts

Signed-off-by: Ahmad-Wahid <ahmedwahid16101@gmail.com>

* drop the changes that were made for speeding the vegalite

Signed-off-by: Ahmad-Wahid <ahmedwahid16101@gmail.com>

* connect histgram horizentally and move x-axis to the top of the chart

Signed-off-by: Ahmad-Wahid <ahmedwahid16101@gmail.com>

* stack the legends below the subplots if option is chosen

Signed-off-by: Ahmad-Wahid <ahmedwahid16101@gmail.com>

* fix: use asset name with sensor name in the chart legends

Signed-off-by: Ahmad-Wahid <ahmedwahid16101@gmail.com>

* fix: show source chart lines

Signed-off-by: Ahmad-Wahid <ahmedwahid16101@gmail.com>

* fix: vertical concatination of subplots

Signed-off-by: Ahmad-Wahid <ahmedwahid16101@gmail.com>

* fix: ECharts

Signed-off-by: Ahmad-Wahid <ahmedwahid16101@gmail.com>

* fix: derive sensor-type from shared unit and improve ECharts legends

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* fix: export full legends without toolbox and drop restore button

* fix: match axis and title font size and color to Vega-Lite

* fix: show sensor-page legend with Source title and Vega-Lite-style labels

* fix: add minor gridlines to line and bar charts like Vega-Lite

* feat: match fast ECharts charts to Vega-Lite (annotations, colors, ramps, fonts)

- show hover annotations on the sensor page, matching the Vega-Lite
  SHADE_LAYER/TEXT_LAYER (gray bands, highlight + label on hover)
- use tableau10 colors and zero-based y-axis like Vega-Lite
- use linear interpola... (continued)

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