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, 24 insertions, 3 deletions

diff --git a/nba/cli.py b/nba/cli.py
index 82c3883..e5f460d 100644
--- a/nba/cli.py
+++ b/nba/cli.py
@@ -13,12 +13,33 @@ def nba() -> None:
     Parse command-line arguments and display either scoreboard or standings.
     """
     parser = argparse.ArgumentParser(description="NBA Scoreboard and Standings")
-    parser.add_argument("--scores", action="store_true", help="Display the scoreboard")
     parser.add_argument(
-        "--standings", action="store_true", help="Display the standings"
+        "--scores", "-sc", action="store_true", help="Display the scoreboard"
+    )
+    parser.add_argument(
+        "--standings", "-st", action="store_true", help="Display the standings"
+    )
+    parser.add_argument(
+        "--tui", action="store_true", help="Launch the interactive TUI"
+    )
+    parser.add_argument(
+        "--refresh",
+        type=int,
+        default=60,
+        metavar="SECONDS",
+        help="Auto-refresh interval in TUI mode (default: 60, minimum: 10)",
     )
     args = parser.parse_args()
 
+    if args.tui:
+        from nba.tui.app import NBAApp
+
+        initial_tab = "standings" if args.standings else "scores"
+        refresh_interval = max(args.refresh, 10)
+        NBAApp(initial_tab=initial_tab, refresh_interval=refresh_interval).run()
+        return
+
+    # Legacy static mode
     games, ranks = fetch_data.fetch_data()
 
     if args.scores:
@@ -26,4 +47,4 @@ def nba() -> None:
     elif args.standings:
         standings.build_standings(ranks)
     else:
-        print("Please specify --scores or --standings")
+        print("Please specify --scores or --standings (or use --tui for interactive mode)")