fix: clean shared links + add copy-link button

[GeiserX]

Summary

Two small follow-ups to the v1.6.0 sharing feature, from live feedback:

1. Shared links no longer carry redundant text. The route share was sending text: "Pumperly route" and the station share text: "<brand> — <price>". Native share targets prepend the text field to the URL, so shared route links arrived as Pumperly route https://… — the "extra words at the end" the user reported. Now both share { title, url } only (title populates the share-sheet heading without polluting the link).
2. Added a Copy-link button to the station popup (clipboard icon → checkmark) next to Share, so users can copy the station deep-link directly without going through the native share sheet. copyToClipboard() is now exported from lib/share.ts.
3. i18n popup.copyLink across all 16 locales.

Test plan

• tsc clean
• 530 tests pass (+2 popup tests: action-row buttons + copy-link writes the deep-link)
• next build ok

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 619a4fac-eb12-43d7-9191-ca20a9344b48

📥 Commits

Reviewing files that changed from the base of the PR and between 060a91b and 9149f1e.

📒 Files selected for processing (5)

• src/components/map/station-popup.test.tsx
• src/components/map/station-popup.tsx
• src/components/search/search-panel.tsx
• src/lib/i18n.tsx
• src/lib/share.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/share-link-tidy

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