fix: status bar shows 26K instead of 260K for token counts with trailing zeros (#3024)

format_token_count_compact() used unconditional rstrip("0") to clean up
decimal trailing zeros (e.g. "1.50" → "1.5"), but this also stripped
meaningful trailing zeros from whole numbers ("260" → "26", "100" → "1").
Guard the strip behind a decimal-point check.

Co-authored-by: kshitijk4poor <82637225+kshitijk4poor@users.noreply.github.com>

agent/usage_pricing.py

@@ -649,7 +649,8 @@ def format_token_count_compact(value: int) -> str:
                 text = f"{scaled:.1f}"
             else:
                 text = f"{scaled:.0f}"
-            text = text.rstrip("0").rstrip(".")
+            if "." in text:
+                text = text.rstrip("0").rstrip(".")
             return f"{sign}{text}{suffix}"
 
     return f"{value:,}"