Fossify Phone

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* Added quick dial-back feature.
* The hang-up button is now always visible in the call UI.
* Enhanced the size of caller avatar and buttons in the call UI.
* Reorganized dialpad preferences into their own dedicated section.
* Added placeholder avatar for unknown numbers and contacts without photo.
* Added a progress indicator to indicate call history retrieval.
* Added bottom padding in lists to allow scrolling above the floating action button.
* Added some translations.