Fix PAT exposure, i18n selectors, and UI compatibility issues

[Copilot]

Addresses 4 critical bugs affecting security, internationalization, and UI compatibility across multiple extensions.

Changes

spotifyBackup: Prevent GitHub PAT auto-revocation (#52)

GitHub scans all gists and auto-revokes PATs found in content. Sanitize backup data before upload:

function sanitizeBackupData() {
    const data = { ...localStorage };
    const settings = JSON.parse(data["spotifyBackup:settings"]);
    delete settings.gistToken;  // Exclude from gist upload
    return data;
}

Preserve current token during restore by reading from localStorage post-restoration instead of re-parsing backup.

npvAmbience: Language-independent selectors (#49)

Replace hardcoded English aria-label selectors with structural selectors:

// Before: aside[aria-label="Now playing view"]
// After:  .Root__right-sidebar aside

playbarClock: Remove button background artifact (#33)

Explicitly set backgroundColor: "transparent" on clock button to prevent theme bleed-through.

sleepTimer: Multi-version DOM selector fallbacks (#32)

Add fallback selectors for Spotify UI changes:

nowPlayingWidget = document.querySelector(".main-nowPlayingWidget-nowPlaying") 
    || document.querySelector(".main-nowPlayingBar-left");

All changes use Object.prototype.hasOwnProperty.call() for safer property checks.

Original prompt

create me a pr fixing all current issues

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