Add a Saver implementation (with resize feature to support it)#8
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Resizing the pad previously always cleared the signature. SignaturePadState now takes a ResizeBehavior controlling how an in-progress signature is remapped: Clear (default), Center, Fit, Stretch, or a per-point Custom mapper. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Fixes #2. SignaturePadStateImpl is not Parcelable/Serializable, so it could not survive configuration changes (e.g. orientation) out of the box. Add a SignaturePadStateSaver factory that flattens the signature (pad size, started flag, and each bezier's source points) to a List<Float>, and a new rememberSaveableSignaturePadState that uses rememberSaveable to preserve the signature. rememberSignaturePadState is left unchanged. The resize behavior is supplied to the saver rather than serialized, since Custom may hold a non-serializable lambda. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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