Release 1.4.1: a Bonded checkbox in the terminal tables

The config's per-terminal bonded key becomes editable in the dialog
(previously file-only, shown as a text suffix): checked, the
terminal's contacts short into one internally joined lug - the total
value stays prescribed, the per-contact split is a solve outcome.
Same-name rectangle groups seed it checked as before; unchecking one
falls back to the per-cell area share, and checking a single-contact
terminal gives it an equipotential-lug contact instead of uniform
injection. Save config... writes the flag back (removed when
unchecked - false is the schema default). With this, every
non-structural terminal option (active, values, v_oc, contact layer,
bonded, comment) is table-editable.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

fill_resistance/dialog.py

@@ -122,10 +122,13 @@ class PdnTerminalRow:
     i_draw_a: float | None = None   # loads; None = not entered yet
     r_out_ohm: float | None = None  # supplies; None = not entered yet
     v_oc: float | None = None       # supplies; None = v_nominal
-    bonded: bool = False          # multi-contact lug: the TOTAL value
-                                  # applies, the per-contact split is a
-                                  # solve outcome (display/data only -
-                                  # not editable in the table)
+    bonded: bool = False          # checkbox: short the contacts into
+                                  # one lug - the TOTAL value applies,
+                                  # the per-contact split is a solve
+                                  # outcome. Seeded True for same-name
+                                  # rectangle groups and from the
+                                  # config's "bonded" key; a single
+                                  # contact checked = equipotential lug
     contact: str = "all"          # terminal-level layer scope: "auto"
                                   # (per contact part - config-backed
                                   # rows only), "all", or a layer name
@@ -304,8 +307,10 @@ class _Dialog(QDialog):
                 # the role/layer mapping lives in the table titles now
                 hints.append("name from a text item inside the "
                              "rectangle; empty V_oc = V nominal")
-            hints.append("Layer = the copper the terminal contacts; "
-                         "values take SI suffixes (50m = 0.05)")
+            hints.append("Bonded = contacts joined into one lug (the "
+                         "per-contact split is solved); Layer = the "
+                         "copper the terminal contacts; values take SI "
+                         "suffixes (50m = 0.05)")
             hint = QLabel(" — ".join(hints))
             hint.setWordWrap(True)
             hint.setStyleSheet("color: gray; font-size: 10px;")
@@ -532,10 +537,11 @@ class _Dialog(QDialog):
         for role, cols in (
                 ("supply",
                  ["Active", "Name", "Component", "R_out [Ω]",
-                  "V_oc [V]", "Layer", "Contact parts", "Comment"]),
+                  "V_oc [V]", "Bonded", "Layer", "Contact parts",
+                  "Comment"]),
                 ("load",
-                 ["Active", "Name", "Component", "I draw [A]", "Layer",
-                  "Contact parts", "Comment"])):
+                 ["Active", "Name", "Component", "I draw [A]",
+                  "Bonded", "Layer", "Contact parts", "Comment"])):
             n = sum(1 for r in pdn.rows if r.role == role)
             panel = QWidget()
             pv = QVBoxLayout(panel)
@@ -562,7 +568,8 @@ class _Dialog(QDialog):
             self._pdn_map.append((t, i))
             values = ([row.r_out_ohm, row.v_oc] if row.role == "supply"
                       else [row.i_draw_a])
-            last = t.columnCount() - 1       # ... | Layer | parts | Comment
+            # tail columns: ... | Bonded | Layer | parts | Comment
+            last = t.columnCount() - 1
             cells = [(1, row.name, False), (2, row.component, False)]
             for col, value in enumerate(values, start=3):
                 cells.append((col, "" if value is None else f"{value:g}",
@@ -579,6 +586,11 @@ class _Dialog(QDialog):
             box.setFlags(Qt.ItemIsEnabled | Qt.ItemIsUserCheckable)
             box.setCheckState(Qt.Checked if row.active else Qt.Unchecked)
             t.setItem(i, 0, box)
+            bond = QTableWidgetItem("")
+            bond.setFlags(Qt.ItemIsEnabled | Qt.ItemIsUserCheckable)
+            bond.setCheckState(Qt.Checked if row.bonded
+                               else Qt.Unchecked)
+            t.setItem(i, last - 3, bond)
             combo = QComboBox()
             idx = len(self._pdn_layer_combos)
             self._pdn_layer_combos.append(combo)
@@ -695,12 +707,14 @@ class _Dialog(QDialog):
             new = PdnTerminalRow(name=row.name, role=row.role,
                                  resolved=row.resolved,
                                  component=row.component,
-                                 bonded=row.bonded,
                                  from_config=row.from_config)
             box = t.item(r, 0)
             checked = (box is None
                        or box.checkState() == Qt.Checked)
             new.active = checked and not self._row_hidden(i)
+            bond = t.item(r, t.columnCount() - 4)
+            new.bonded = (bond is not None
+                          and bond.checkState() == Qt.Checked)
             new.comment = cell(t.columnCount() - 1)
             combo = self._pdn_layer_combos[i]
             new.contact = (combo.currentData() if combo.count()