Add ICY metadata extraction for now playing info

[Copilot]

Internet radio streams often embed track metadata via ICY (Icecast/Shoutcast) protocol. This PR extracts and displays "now playing" information when available.

Changes

• StreamMetadata model - Holds parsed metadata (StreamTitle, Artist, Title) with display formatting
• StreamMetadataService - Connects with Icy-MetaData: 1 header, reads icy-metaint intervals, parses StreamTitle='Artist - Song'; format, polls every 15s
• RadioPlayerService integration - Starts/stops metadata polling on play/pause, exposes CurrentMetadata property and StreamMetadataChanged event
• PlayerViewModel - Exposes NowPlaying and HasNowPlaying for UI binding
• PlayingPage.xaml - Displays now playing section when metadata available
• App.xaml.cs - Updates tray icon tooltip with current song details when playing (truncated to 60 chars for readability)

How ICY metadata works

Client → Server: Icy-MetaData: 1
Server → Client: icy-metaint: 8192

[8192 bytes audio][1 byte len][len*16 bytes metadata][8192 bytes audio]...

Metadata: StreamTitle='Artist - Song';

The service reads past the audio chunk, extracts the metadata block, and parses artist/title from common separator formats (-, –, —).

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Get metadata about streaming content</issue_title>
<issue_description>Does stream URL contain content about song and artist? Maybe another URL on the radio station DB Item contains information about "current now playing"</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Get metadata about streaming content #37

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[TheJoeFin]

@copilot looks great! Also update the Tooltip on the NotifyIcon with the song details if available

[Copilot]

@copilot looks great! Also update the Tooltip on the NotifyIcon with the song details if available

Done in f0afcaf. The tray icon tooltip now shows the current song when playing:

• "Trdo (Playing)\n{Artist - Title}" when now playing info is available
• "Trdo (Playing)" when no metadata available
• "Trdo (Paused)" when stopped

Long song titles are truncated to 60 characters to keep the tooltip readable.