feat(ui-studies): disable the creation of variants and launch of archived studies

[skamril]

ANT-4836

[Copilot]

Pull request overview

This PR updates the studies UI to prevent actions that should not be possible on archived studies, specifically variant creation and batch launching.

Changes:

• Hide “create variant / copy” actions for archived studies in the Study Information view.
• Update batch launch to only launch unarchived selected studies, with clearer tooltip/count feedback in the header actions.
• Add i18n strings for the new “launch only unarchived studies” messaging (and remove the unused “batch mode” key).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
webapp/src/routes/_authenticated/studies/$studyId/-components/InformationView/index.tsx	Prevents variant creation/copy actions from being shown when a study is archived.
webapp/src/routes/_authenticated/studies/-components/StudiesList/Header/index.tsx	Filters batch launch to unarchived studies and wires new props into batch actions.
webapp/src/routes/_authenticated/studies/-components/StudiesList/Header/BatchActions.tsx	Adds unarchived selection handling and messaging for Launch button in batch mode.
webapp/public/locales/fr/main.json	Adds French translations for “launch only unarchived studies” tooltip text and removes unused key.
webapp/public/locales/en/main.json	Adds English translations for “launch only unarchived studies” tooltip text and removes unused key.

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The base branch was changed.