feat: add issue 528 settings and UI rendering fixes

[Kiramei]

What changed

• add desktop and Android GUI settings for unrestricted decisive battle formation behavior from issue #528
• add friend cleanup thresholds while preserving the existing friend whitelist
• add complete translations for all seven supported locales
• keep the home log viewer mounted across page switches so virtualized logs repaint correctly
• render configuration cards without motion wrappers in low-performance mode
• keep loading spinners animated in low-performance mode

Why

Issue #528 configuration fields were only available through manual configuration. Separately, suspended virtualized content could return blank after page navigation, and disabling motion wrappers incorrectly prevented configuration cards and loading indicators from rendering normally in low-performance mode.

Validation

• bunx tsc --noEmit
• bun test tests/frontend — 12 passing
• ESLint with sibling worktrees excluded
• bun run i18n:check — 539 keys across 7 locales
• bun run build:tauri
• bun run build:tauri:android
• cargo test --workspace — 125 passing