Pencil button next to each hero disk opens an editor dialog that parses
the D64 directly, lists all PRG save files in a spinner, and lets the
user adjust all nine stats (Vitalität, grade, six percentage stats) with
+/− buttons. Changes to multiple heroes in one session are written back
together on Save.
PETSCII decoding now distinguishes unshifted (0x41–0x5A → lowercase) from
shifted (0xC1–0xDA → uppercase) so names display in natural mixed case
(e.g. "Mark" instead of "MARK").
D64 sector layout helpers extracted to class level so createBlankD64 and
the new editor share the same offset function. Save format documented in
res/HELD_D64_FORMAT.md. Editor strings localised in EN/DE.
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