joren 5bda2396d1 fix: security hardening and code quality improvements ...

Build hardening:
- Add -fstack-protector-strong, -D_FORTIFY_SOURCE=2, PIE, full RELRO
- Enable overflow-checks in Rust release profile

Rust backend:
- Return null (not panic) if Tokio runtime or QobuzClient init fails
- Strip null bytes in FFI JSON callback to prevent CString panics
- Document MD5 and password-in-query as Qobuz API constraints

C++ frontend:
- Validate JSON document before accessing fields in onEvent()
- Handle null backend pointer from failed init
- Set biography label to PlainText and decode HTML entities to prevent
  rendering injected content from API responses
- Clamp slider position and guard negative durations
- Use qint64 for duration formatting to avoid int truncation

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-24 23:19:04 +01:00

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