fix(py): make junior '?' cell text sticky across exception overrides

Go's build_juniors sets cellText = "?" + countStr whenever
md.IsUnknown is true, regardless of whether an exception overrides the
expected amount. Python was checking expected == "?" for this branch,
but reconcile replaces expected with the exception amount (e.g. 0)
before the view builder runs, so the "?" was silently dropped to "-".

Fix: derive is_unknown from original_expected == "?" (set before
exception substitution) instead of expected == "?". Also align the
tooltip guard: Go only shows Received/Expected tooltip for non-unknown
months (or when paid > 0), matching the same is_unknown flag.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/views.py

@@ -310,8 +310,9 @@ def build_juniors_view_model(
             cell_text = "-"
             amount_to_pay = 0
 
-            if expected == "?" or (isinstance(expected, int) and expected > 0):
-                if expected == "?":
+            is_unknown = original_expected == "?"
+            if is_unknown or (isinstance(expected, int) and expected > 0):
+                if is_unknown:
                     status = "empty"
                     cell_text = f"?{count_str}"
                 elif paid >= expected:
@@ -339,7 +340,7 @@ def build_juniors_view_model(
                 status = "surplus"
                 cell_text = f"PAID {paid}"
 
-            if (isinstance(expected, int) and expected > 0) or paid > 0:
+            if (not is_unknown and isinstance(expected, int) and expected > 0) or paid > 0:
                 tooltip = f"Received: {paid}, Expected: {expected}"
             else:
                 tooltip = ""