FirmMux v1.0.4-beta7

TL;DR

• Add FirmMux updater app and docs updates
• ui: confirm cache clear and harden toast wrapping/centering
• pathfile: add per-system toggle and model-aware defaults
• perf: memoize cover preview selection without stack-heavy key buffer

Since v1.0.4-beta6

• Commits included in this release:
  • Add FirmMux updater app and docs updates
  • ui: confirm cache clear and harden toast wrapping/centering
  • pathfile: add per-system toggle and model-aware defaults
  • perf: memoize cover preview selection without stack-heavy key buffer
  • fix: guard option/menu indices during rapid state changes
  • fix: tighten shutdown cleanup for audio and transient buffers
  • harden: validate path formatting and reject truncation in launch flows
  • fix: harden runtime/cover flow failure handling

Included Assets

• FirmMux-SD.zip (contents of SD/ for end-user copy)