v0.3.4

Automated release from cc205c4b05d190339e83ca42859d76fc83bc6513.

Changelog since v0.3.3:

• hardening: production release signing + checksums + sig verify (cc205c4)

Signature: DotNotes Release (RSA 4096) — verify with apksigner verify --print-certs.
Checksums: see app-release.apk.sha256 / .sha512 assets.
Built via assembleRelease (R8 + shrinkResources), attested with actions/attest-build-provenance.

Note: v0.3.0–v0.3.2 were signed with debug keystore; from v0.3.3+ real release key is used. Debug users must reinstall (signatures differ).

Full Changelog: v0.3.3...v0.3.4