Added a confirmation popup to `SenderEditorPage.razor` for clearing all signature fields, requiring user confirmation before proceeding. Updated resource files (`Resource.de-DE.resx`, `Resource.en-US.resx`, `Resource.fr-FR.resx`) with localized confirmation messages. Modified the "Remove all signature fields" button to trigger the popup instead of directly invoking the clear action.
Introduced a new `_clearFieldsConfirmVisible` variable to manage popup visibility. Updated the `ClearAllFieldsAsync` method to close the popup before clearing fields. Added new CSS styles in `envelope-viewer.css` to style the confirmation popup and its elements.
TekH
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