Quick win: Copy custom tab URL on long click

[0nko]

Task/Issue URL: https://app.asana.com/1/137249556945/project/1207418217763355/task/1212330168162876?focus=true

Description

This PR implements URL copying on long-click in the custom tab.

Steps to test this PR

• Go to Settings -> Developer settings -> Custom tabs
• Launch a custom tab
• Long-tap on the address bar
• Notice a toast pops up, saying the URL was copied
• Try pasting it somewhere and verify it's correct

---

Note

Adds long‑press copy for custom tab URL with minimal UI feedback and tests.

• In OmnibarLayout, long‑press on custom tab toolbar triggers onCustomTabUrlLongClicked(); handles Command.CopyUrlToClipboard by using ClipboardInteractor and showing urlCopiedToClipboard toast when needed
• In OmnibarLayoutViewModel, adds CopyUrlToClipboard command and onCustomTabUrlLongClicked() to emit it when a URL is present
• Adds localized urlCopiedToClipboard strings across languages
• Tests verify command emission for valid/empty URLs

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
_{Learn more about Cursor Agents}