Add eight-language support, language-first onboarding, and optional Ice Bar fades

[gmkrxb]

Summary

Add application language selection, a language-first onboarding flow, and optional fade transitions for Ice Bar.

Language selection

• Support eight languages: English, Simplified Chinese (简体中文), Traditional Chinese (繁體中文), Japanese (日本語), Korean (한국어), French (Français), German (Deutsch), and Spanish (Español).
• Add a Language submenu to both the Ice icon menu and the empty-menu-bar context menu, plus a language picker in General settings.
• Provide a Follow System option and persist explicit language choices per application. Changing the language restarts Ice so SwiftUI, AppKit, and framework-provided interfaces use the selected language consistently.
• Add 216 localized strings covering settings, menus, permission guidance, search, notifications, errors, and animation controls.
• Localize interpolated durations and section names, icon names, and the last-update-check date.

First-launch language selection

• Show a dedicated language-selection screen before the permission setup screen.
• Preview the selected language immediately in the onboarding text and buttons; display language names in their native scripts.
• Defer permission checks until the initial language choice has been completed.

Optional Ice Bar fade transitions

• Add a persistent “Fade Ice Bar in and out” toggle under General settings when Ice Bar is enabled; default to off.
• Fade in/out over approximately 180 ms and respect macOS Reduce Motion.
• Cancel obsolete presentation requests and ongoing fades when users quickly toggle the bar or switch sections. Stop intercepting clicks as soon as dismissal begins.
• Apply transitions to Ice Bar; native third-party menu bar icons retain their existing behavior.

Related fixes and build support

• Prefer the system screen-recording permission check and inspect all eligible menu bar items instead of rejecting access based on the first untitled item.
• Refresh permissions when the application becomes active; add refresh, restart, and reveal-current-app actions to help with stale permission entries.
• Remove the shared permission continuation that could be left suspended after repeated permission requests, and guard against repeated application setup.
• Clear invalidated auto-rehide timers and release the temporary window-capture buffer.
• Include localization checks and a local build helper that applies a minimal CompactSlider compatibility adjustment for newer SwiftUI SDKs. The helper selects a unique Apple Development signing identity by default to preserve application identity and privacy permissions across rebuilds. An explicit ICE_CODE_SIGN_IDENTITY override is supported; ad-hoc signing is opt-in with a warning. Hardened runtime remains enabled for certificate-signed builds; project release signing settings remain unchanged.

Follow-up: macOS 26 hosted menu bar compatibility

• Fix the reported Ice Bar crash caused by converting an out-of-range AppKit window number to CGWindowID; use checked conversions and resolve hosted control windows through the menu bar list.
• Recognize Ice control-item autosave titles when hosted by Control Center, accept menu bar item layers used by Tahoe, and tolerate missing nonessential window metadata.
• Retry failed item caching and refresh hosted items even when window IDs are unchanged. Allow vertical menu bar insets when capturing icon images.
• These changes address the supplied crash report and empty-layout code paths; interactive verification remains pending.

Validation

• Release build succeeded with Xcode 27 for both arm64 and x86_64.
• Earlier two-language resource/persistence checks passed before expanding the catalog to eight languages. The expanded catalog compiled successfully.
• Interactive UI, permission-grant, and animation testing has not been completed. Translations would benefit from native-speaker review.