feat(localities-geocode): add structured response panel

[shwetadeshmukh]

Issue

Closes #114

Describe your changes

Adds a div in the localities-geocode sample with a structured response panel that surfaces the full geocode result alongside the map.

• Adds a response-panel containing:
  • A summary of the geocoded location
  • An address-components breakdown
  • A collapsible <details> block with the raw JSON response from Api
  • A copy-to-clipboard button with visual confirmation (.copied state swaps the icon to a checkmark)
• Extracts a reusable copy-button SCSS mixin in shared/scss/_mixins.scss so future samples can reuse the same styling.

How to test

1. Test on PR deploy
2. Open the localities-geocode sample in the browser.
3. Empty state — confirm the right-hand panel shows the hint "Enter an address to geocode or click on the map to reverse geocode."
4. Forward geocode — type an address in the search box; click Enter; confirm the panel populates with summary, address components, and collapsible raw JSON.
5. Reverse geocode — click anywhere on the map; confirm the panel updates with the reverse-geocoded result.
6. Copy button — open Raw JSON, click the copy icon; confirm the icon swaps to a checkmark and the JSON is on your clipboard.

Checklist:

• My code follows the style guidelines for this repo
• My code passes the SonarCloud check and does not add new code smells
• I have performed a self-review of my code
• My changes generate no new warnings/errors
• I have added tests that prove my fix is effective or that my feature works
• I don't require ops changes for this PR to go to prod
• This change does not include a migration

Documentation

N/A — sample-only change; no public API surface affected.

Libs/SDKs

N/A — no library or SDK changes.

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