feat(apm): refine service map dashboard panel design

[jennypavlova]

Preview:

design_changes.mov

Summary

Design-review refinements for the service map → dashboard creation/edit workflow, stacked on top of the PoC branch so this diff contains only the design changes (easy to share with product).

Note

This PR is based on 271275-apm-poc-service-map-dashboard-creationedit-workflow (the PoC branch), not main, so the diff shows just the latest design feedback round.

What changed

• "Copy to dashboard" → Share menu on the left controls. The action moved out of a top-right ... menu into a share-icon button grouped with the other service map controls on the left. Clicking it opens a small menu with a single Copy to dashboard item (the APM map isn't a Lens viz, so its controls stay together).
• The dashboard embeddable is now a minimal "preview". The in-panel options (filters, find-in-page search, and layout orientation) are no longer shown on the dashboard panel — just the map with zoom controls + legend.
• Filters + layout moved to the edit flyout. The edit flyout now configures the view filters (Dependencies, Alert status, SLO status, Anomaly severity) and the Presentation → Layout (Horizontal/Vertical) orientation, persisted on save.
• Removed the "Find a service" field from the flyout (no real value in the panel config).
• The full in-app APM service map is unchanged — search, filters, and the inline layout control still live in its options panel.

Validation

• type_check (apm), eslint, and i18n_check all pass.

References

• Design feedback: elastic/observability-dev#5458 (comment)

Draft for product/design review — not intended to merge into the PoC branch as-is.

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