Full-GUI builds for Windows ARM64 + Linux RISC-V 64 (deps: opticaldiscs 0.5, libchdman 0.288.8)

[danifunker]

Summary

Promotes Windows ARM64 and Linux RISC-V 64 to first-class, full desktop-app builds, unblocked by the libchdman-rs bump. Both new CI legs passed green on the first run (run 28443141702).

Two commits:

1. deps: opticaldiscs 0.4.2 → 0.5, libchdman-rs 0.288.5 → 0.288.8

• opticaldiscs 0.5 changes FileEntry::type_code/creator_code from Option<String> (lossy display string) to Option<[u8; 4]> (raw Finder bytes), adding type_code_string()/creator_code_string() for display.
• Fixes a latent extraction bug: the optical AppleDouble/MacBinary export rebuilt the Finder type/creator from the display string, so a non-printable 4-byte creator (e.g. Prince of Persia's 50 6F C4 50, rendered "0x506FC450") was corrupted to b"0x50". The fourcc/fourcc_bytes reparse helpers are deleted; raw fields are used directly; display sites use the new *_string() methods.
• libchdman-rs 0.288.8 publishes aarch64-pc-windows-msvc and riscv64gc-unknown-linux-gnu prebuilts — the only blocker to GUI builds on those targets. Both deps still dedupe to a single libchdman copy.
• Verified locally (--features optical): build, 44 test suites, clippy -D warnings, fmt --check all clean; cargo tree -i libchdman-rs → single 0.288.8.

2. ci: first-class full-GUI builds for Windows ARM64 and Linux RISC-V 64

• build-windows-arm64 (was build-rb-cli-win-arm64, CLI-only): one default-feature build on the x64 Windows runner now produces both rusty-backup.exe and rb-cli.exe; packages a portable GUI zip alongside the rb-cli zip. Build-only (continue-on-error) since an ARM64 exe can't run on the x64 host.
• build-gui-linux-riscv64 (new): cross-compiles the default-feature GUI for riscv64gc against a riscv64 GTK/GL sysroot installed via dpkg multiarch (ubuntu-ports), links through g++ (libchdman is C++), and ships a plain dynamically-linked tarball — not a self-contained AppImage, since there's no riscv64 runner to package one. continue-on-error.
• Downloads table: Windows ARM64 and RISC-V 64 promoted into the main first-class table (App + rb-cli columns); their rb-cli rows moved up out of the "other CPU architectures" table, which now lists only PowerPC. Nothing removed from the chart.

Verification

riscv64 GUI binary confirmed a genuine RISC-V GTK app:

ELF 64-bit LSB pie executable, UCB RISC-V, RVC, double-float ABI ... interpreter /lib/ld-linux-riscv64-lp64d.so.1
NEEDED  libgtk-3.so.0, libgobject-2.0, libglib-2.0, libstdc++.so.6, libgcc_s, libm, libc

All four new artifacts uploaded (GUI: ~30 MB win-arm64 zip / ~32 MB riscv64 tarball; plus the two rb-cli builds).

Notes

• Both new jobs are continue-on-error, so a future breakage on these niche legs can't block the desktop release.
• Merging to main triggers the real Release run that publishes these as downloads.

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