Refine provider header copy controls

[robinebers]

TL;DR

Replaces the dashboard provider drag grip with the provider icon and adds a hover-revealed copy control with consistent success feedback. Customize keeps its existing drag controls unchanged.

What was happening

• Dashboard provider headers showed a dedicated drag grip even though the full header was already draggable.
• Provider screenshot copying had no local micro-feedback, while Total Spend maintained a separate share-specific animation.
• The copy glyph’s visual frame also defined its click target, making the control unnecessarily precise to hit.

What this changes

• Moves the provider icon to the leading edge and keeps full-header provider reordering intact.
• Adds a trailing copy button that appears on header hover and uses the existing screenshot-to-clipboard flow.
• Introduces one shared copy-feedback control with a 28×28 hit target, a success-only checkmark animation, and centralized reset timing.
• Uses the same copy control for provider screenshots and Total Spend.
• Leaves Customize unchanged.

Tests

• ./script/build_and_run.sh verify
• Release build, signing, relaunch, and process verification succeeded.

Screenshots