refactor!: rename somafm-tui to beefy-player

The app is now a general internet-radio player rather than a SomaFM client, so the package, console script, MPRIS identity, mpv namespaces, macOS tap names, XDG directories and docs all move to beefy-player.

Environment variables are now BEEFY_* (the old SOMAFM_* spellings are still honoured) and an existing ~/.config/somafm-tui/config.json is migrated on first run, so favourites and volume survive the rename.

The visible interface is untouched: same layout, same logo, same keys.

pyproject.toml

@@ -1,13 +1,13 @@
 [project]
-name = "somafm-tui"
+name = "beefy-player"
 version = "0.1.0"
-description = "A flashy terminal radio for SomaFM with a live spectrum analyser, MPRIS / macOS Now Playing support and song history"
+description = "A flashy terminal player for internet radio — live spectrum analyser, MPRIS / macOS Now Playing support, song history and pluggable station catalogues (SomaFM included)"
 readme = "README.md"
 license = "WTFPL"
 license-files = ["LICENSE"]
 requires-python = ">=3.10"
-authors = [{ name = "somafm-tui contributors" }]
-keywords = ["somafm", "radio", "tui", "terminal", "mpris", "audio"]
+authors = [{ name = "beefy-player contributors" }]
+keywords = ["radio", "internet-radio", "tui", "terminal", "mpris", "audio", "somafm"]
 classifiers = [
   "Environment :: Console",
   "Intended Audience :: End Users/Desktop",
@@ -31,17 +31,17 @@ dependencies = [
 ]
 
 [project.scripts]
-somafm-tui = "somafm_tui.__main__:main"
+beefy-player = "beefy_player.__main__:main"
 
 [build-system]
 requires = ["hatchling"]
 build-backend = "hatchling.build"
 
 [tool.hatch.build.targets.wheel]
-packages = ["somafm_tui"]
+packages = ["beefy_player"]
 
 [tool.hatch.build.targets.wheel.force-include]
-"somafm_tui/theme.tcss" = "somafm_tui/theme.tcss"
+"beefy_player/theme.tcss" = "beefy_player/theme.tcss"
 
 [dependency-groups]
 dev = [
@@ -60,8 +60,8 @@ extend-exclude = ["dist", ".venv", "build"]
 
 [tool.ruff.lint]
 select = ["E4", "E7", "E9", "F", "I", "UP", "B", "SIM", "RUF"]
-ignore = ["RUF001"]  # en/em dashes are part of real SomaFM metadata
+ignore = ["RUF001"]  # en/em dashes are part of real station metadata
 # dbus-next needs short signature strings ("s", "a{sv}", "x", …) in
 # annotations; they are not Python names.
 [tool.ruff.lint.per-file-ignores]
-"somafm_tui/mpris.py" = ["F821", "F722", "UP037"]
+"beefy_player/mpris.py" = ["F821", "F722", "UP037"]