RO-3182: Erstatt istykkelse-plott med lenke til iskart

[jorgkv]

• Fjerner istykkelse-plott
• Legger til lenke til iskart, for å se istykkelse der
• Legger også til lenke til iskart for å gå til samme kartutsnitt der

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[Copilot]

Pull request overview

This PR removes the embedded ice-thickness plot integration and replaces it with links to iskart.no for viewing ice thickness/layering and for opening the same map extent.

Changes:

• Removed plot.regobs.no configuration and deleted the Plot/IcePlot implementation.
• Added iskart.no links in the observation details UI (map extent + ice thickness context link).
• Updated IceThicknessViewComponent inputs to build an iskart.no URL from ObsLocationID and observation date.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/settings.ts	Removes plotUrl service configuration.
src/assets/i18n/nb.json	Adds new ISKART.* translation keys (Norwegian).
src/assets/i18n/en.json	Adds new ISKART.* translation keys (English).
src/app/pages/view-observation/view-observation.page.ts	Adds computed iskartUrl for ice observations; removes PlotService usage.
src/app/pages/view-observation/view-observation.page.scss	Adds styling for the new iskart link block.
src/app/pages/view-observation/view-observation.page.html	Renders new iskart link; updates ice thickness component bindings.
src/app/core/services/plot.service.ts	Deleted (no longer needed).
src/app/components/observation/registrations/ice-thickness-view/ice-thickness-view.component.ts	Replaces plot URL logic with iskart URL logic; new inputs.
src/app/components/observation/registrations/ice-thickness-view/ice-thickness-view.component.html	Replaces plot UI with iskart link + summary.
src/app/components/observation/registrations/ice-thickness-view/ice-thickness-view.component.css	Removes prior host layout styling.
src/app/components/observation/observation/observation.component.html	Updates ice thickness view bindings (but still includes a stale regId binding).
src/app/components/observation/graphics/ice-plot.component.ts	Deleted (no longer needed).

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