Add all Yellowstone Club snow stations to dropdown

Added stations:
- Timberline (YCTIM)
- Andesite (YCAND)
- American Spirit (YCAMS)
- Yellowstone Club Base (YCBAS)
- Great Bear (YCGBR)

Changed from textbox to dropdown for easier station selection.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

app.py

@@ -313,18 +313,22 @@ def analyze_weather_data(site_id, hours):
 with gr.Blocks(title="Weather Station Data Analyzer") as demo:
     gr.Markdown("# Weather Station Data Analyzer")
     gr.Markdown("""
-    Enter a weather station ID and number of hours to analyze.
-    Example station IDs:
-    - YCTIM (Yellowstone Club - Timber)
-    - KBZN (Bozeman Airport)
-    - KSLC (Salt Lake City)
+    Select a weather station and number of hours to analyze.
     """)
-    
+
     with gr.Row():
-        site_id = gr.Textbox(
-            label="Weather Station ID",
-            value="YCTIM",
-            placeholder="Enter station ID (e.g., YCTIM)"
+        site_id = gr.Dropdown(
+            label="Weather Station",
+            choices=[
+                ("Yellowstone Club - Timberline", "YCTIM"),
+                ("Yellowstone Club - Andesite", "YCAND"),
+                ("Yellowstone Club - American Spirit", "YCAMS"),
+                ("Yellowstone Club - Base", "YCBAS"),
+                ("Yellowstone Club - Great Bear", "YCGBR"),
+                ("Bozeman Airport", "KBZN"),
+                ("Salt Lake City", "KSLC")
+            ],
+            value="YCTIM"
         )
         hours = gr.Number(
             label="Hours of Data",