feat: add Textual TUI with auto-refresh, leaders, playoff picture, and box score

Introduces an interactive terminal UI via the `--tui` flag backed by the
Textual framework. Scores and standings auto-refresh on a configurable
interval (default 60s, minimum 10s) using asyncio with nba_api calls
offloaded to a thread pool to keep the event loop unblocked.

New tabs:
- Scores / Standings (existing views, now live-updating)
- Leaders: top-25 by stat category, cycle with < / > keys
- Playoff Picture: conference seeding with clinch/elimination status
- Box Score: per-player live stats, load any game with keys 1–9

Refactored scores.py and standings.py to separate rendering from I/O
(get_scoreboard_table, get_east/west_standings_table), keeping the
existing static CLI path fully intact. Added -sc / -st shortcut flags.

Adds textual>=0.89.1,<7.0 dependency, build-system declaration for uv,
and package-data entry for the bundled .tcss stylesheet.

1 files changed, 14 insertions, 3 deletions

diff --git a/pyproject.toml b/pyproject.toml
index 925317f..2133f02 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ authors = [
 ]
 description = "A CLI interface to get current NBA scores and standings."
 readme = "README.md"
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 license = "GPL-3.0-or-later"
 classifiers = [
     "Programming Language :: Python :: 3",
@@ -15,7 +15,8 @@ classifiers = [
 dependencies = [
     "nba_api",
     "tabulate",
-    "argparse"
+    "argparse",
+    "textual>=0.89.1,<7.0"
 ]
 
 [project.urls]
@@ -25,6 +26,16 @@ Issues = "https://git.cleberg.net/nba-scores.git"
 [project.scripts]
 nba = "nba.cli:nba"
 
+[build-system]
+requires = ["setuptools>=68"]
+build-backend = "setuptools.build_meta"
+
+[tool.uv]
+package = true
+
 [tool.setuptools.packages.find]
 where = ["."]
-include = ["nba"]
+include = ["nba*"]
+
+[tool.setuptools.package-data]
+"nba.tui" = ["*.tcss"]