Updated `getSignatureNavState` to handle cases where the global signature list (`_allSignatures`) is unavailable or empty by introducing an early return with a default state.
Revised the logic to calculate `total`, `signed`, and `unsigned` using the global signature list, simplifying the `currentIndex` calculation to use the `signed` count. Updated `canGoPrev` and `canGoNext` to reflect the presence of signed or unsigned signatures.
Removed outdated logic relying on `signatureButtons` and added Turkish comments to clarify the new implementation.
TekH
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