Feat/add dolphin file system extension

[egalvis27]

Summary

This PR adds Dolphin file manager integration to Internxt Drive on Linux.

What Changed

• Added a Dolphin service menu entry to expose a new Copy Internxt Link action.
• Added the Dolphin helper script that:
  • resolves the selected file path
  • calls the local hydration API
  • copies the generated Internxt link to the clipboard
• Extended the file manager extension installer to detect Dolphin and install the required assets in the correct KDE locations.
• Added logic to reload Dolphin after installing or updating the extension.
• Bumped the file manager extension version so existing installations get the new Dolphin assets.
• Added and updated tests for the file manager extension install and service behavior.

Notes

• The Dolphin integration is packaged alongside the app.
• KDE-specific behavior was adjusted so the menu entry shows correctly and the action runs without permission errors.

Validation

• Focused Vitest coverage for the file manager extension passes.
• Packaging succeeds with npm run package.

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[sonarqubecloud]

Quality Gate failed

Failed conditions
76.6% Coverage on New Code (required ≥ 80%)
C Security Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

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