Make Applications a real app manager, and clean up storage without the racket

Claude-Session: https://claude.ai/code/session_01Ms2FbjQy31TVf3CEvQhGM8

config/dot/quickshell/scripts/panama-snapshots

@@ -308,11 +308,21 @@ def delete(config: str, number: str) -> None:
         raise BoundaryError(_refusal(result, "That snapshot could not be removed."))
 
 
+# The three horizons the page can edit, and the largest number it will accept
+# for any of them. 999 hourly snapshots is not a retention policy, it is a typo
+# that fills a drive; the page offers a dropdown and this is its ceiling. The
+# monthly and yearly limits are left exactly as snapper has them -- nothing here
+# writes them, so a config with longer horizons keeps them.
+RETENTION_LIMIT = 50
+
+
 def set_retention(config: str, hourly: str, daily: str, weekly: str) -> None:
     values = []
     for label, value in (("HOURLY", hourly), ("DAILY", daily), ("WEEKLY", weekly)):
-        if not str(value).isdigit() or int(value) > 999:
+        if not str(value).isdigit():
             raise BoundaryError("Keep counts must be whole numbers.")
+        if int(value) > RETENTION_LIMIT:
+            raise BoundaryError(f"Keep counts go up to {RETENTION_LIMIT}.")
         values.append(f"TIMELINE_LIMIT_{label}={int(value)}")
     result = run(["snapper", "-c", require_config(config), "set-config", *values])
     if result.returncode != 0: