Support color@v1 role in the TUI for dynamic color themes based on the musics artwork

[maximmaxim345]

Subscribes to the color@v1 role and tints panel backgrounds, borders, text, and the visualizer gradient from server-pushed artwork palettes. Adds a t shortcut to toggle dark/light theme, persisted across runs, with fallback to the previous unthemed rendering when no palette is present.

When connected to Music Assistant, the colors will be extracted from the album artwork.

[Copilot]

Pull request overview

This PR adds server-driven artwork palette theming support to the Sendspin TUI by subscribing to the color@v1 role and applying palette-derived colors to panels and the spectrum visualizer, plus a persisted dark/light toggle.

Changes:

• Bump aiosendspin to ~=5.3 to access color@v1 support.
• Subscribe to the color role (Roles.COLOR) and forward palette updates into the TUI, resetting palette on disconnect.
• Extend the visualizer renderer and TUI layout/panels to support palette-based backgrounds and gradients, and add a t keybinding to toggle theme mode (persisted).

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
uv.lock	Updates lockfile to aiosendspin 5.3.0 and associated metadata.
pyproject.toml	Bumps runtime dependency to aiosendspin[server]~=5.3.
sendspin/tui/visualizer.py	Adds palette anchors/background and configurable peak-marker color for spectrum rendering.
sendspin/tui/ui.py	Introduces palette state, theme mode toggle/persistence hook, and palette-tinted panels/layout.
sendspin/tui/keyboard.py	Adds t shortcut mapped to toggling the UI color mode.
sendspin/tui/app.py	Requests Roles.COLOR, attaches color listener, persists theme choice, resets palette on detach.
sendspin/settings.py	Persists color_mode across runs in client settings.

Comments suppressed due to low confidence (1)

sendspin/tui/ui.py:618

• In palette mode, name_style/url_style force hard-coded foreground colors (e.g. white, cyan) which can break contrast in LIGHT mode (panel fg becomes black, but these spans override to white/cyan). Consider passing these through _themed(...) (or omitting explicit fg colors so they inherit the panel’s palette fg).

                # Server name
                name_style = "bold white" if is_selected else "white"
                line.append(server.name, style=name_style)

                # Current server indicator
                if is_current:
                    line.append(" (current)", style=self._themed("dim green"))

                content.add_row(line)

                # Show URL below name
                url_line = Text()
                url_line.append("   ")
                url_style = "cyan" if is_selected else "dim"
                url_line.append(f"   {server.host}:{server.port}", style=url_style)

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