fix: use video.paused for play/pause state detection

[sozercan]

Summary

• Fix play/pause icon not updating when music is playing
• Replace localized button attribute check (title === 'Pause') with video element's paused property
• This change is language-agnostic and works regardless of YouTube Music's display language

Root Cause

The JavaScript observer scripts checked for hardcoded English text in the play/pause button's title and aria-label attributes. When YouTube Music is displayed in a non-English language (e.g., German, Spanish), these attributes contain localized text, causing isPlaying to always return false.

Fix

Use video.paused property directly instead of checking button text:

// Before (fails for non-English locales)
const playPauseBtn = document.querySelector('.play-pause-button.ytmusic-player-bar');
const isPlaying = playPauseBtn?.getAttribute('title') === 'Pause';

// After (language-agnostic)
const video = document.querySelector('video');
const isPlaying = video ? !video.paused : false;

Test plan

• Verify play/pause icon updates correctly when music starts/stops
• Test with YouTube Music set to a non-English language
• Verify keyboard shortcuts (Space) still toggle play/pause correctly
• Verify media keys still work correctly

Fixes #16

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR makes playback state detection language-agnostic by relying on the <video> element’s paused property instead of localized button text, fixing incorrect play/pause icon state in non-English YouTube Music locales.

Changes:

• In SingletonPlayerWebView’s observer script, replace checks against the play/pause button’s title/aria-label attributes with video.paused to derive isPlaying.
• In MiniPlayerWebView’s observer script, remove the now-unneeded playPauseBtn lookup and similarly compute isPlaying from the video element’s paused property.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
Views/macOS/SingletonPlayerWebView+ObserverScript.swift	Updates the main player state observer to compute isPlaying from document.querySelector('video') and its paused property, making play/pause detection locale-independent.
Views/macOS/MiniPlayerWebView.swift	Aligns the mini player’s observer script with the same video.paused-based isPlaying logic and removes the unused play/pause button reference.

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