Display album artwork in the TUI via artwork@v1

[maximmaxim345]

Renders album artwork in the Now Playing panel using the artwork@v1 role. The role is only registered when textual-image detects Kitty graphics or Sixel support at startup. Terminals without graphics support keep the existing layout since the Unicode block fallback can only render a couple of pixels.

Mainly wrote this to more easily test the artwork role since this doesn't require an ESP32 and most on desktop runnable implementations use the image url from the metadata role.

Screenshot

[Copilot]

Pull request overview

Adds support for rendering album artwork in the TUI “Now Playing” panel by negotiating the artwork@v1 role (only when terminal graphics are available) and decoding streamed artwork frames into Pillow images for display via textual-image.

Changes:

• Negotiate artwork@v1 in the TUI client hello when terminal graphics are detected, and plumb decoded artwork into UIState.
• Add an artwork connector (ArtworkHandler) to decode artwork frames and clear artwork on stream end/clear.
• Add a small renderable cache + tests; introduce pillow and textual-image dependencies.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
sendspin/tui/app.py	Negotiates artwork@v1, attaches artwork handler, updates UI state on artwork changes.
sendspin/tui/ui.py	Adds artwork state and renders an artwork column in the Now Playing panel when available/wide enough.
sendspin/tui/artwork.py	New helper to render artwork via textual-image with a small cache and support detection.
sendspin/artwork_connector.py	New connector to decode artwork payloads with Pillow and emit latest image/clear events.
tests/tui/test_artwork.py	Tests for the artwork render helper caching behavior.
tests/test_artwork_connector.py	Tests for artwork decoding, channel filtering, and stream clear/end behavior.
pyproject.toml	Adds pillow and textual-image runtime dependencies.
uv.lock	Locks new dependencies (pillow, textual-image) and their transitive requirements.

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