Fix column order/widths and Chronik pane share in the member view

Forderungen: reorder columns to Fällig, Betrag, Status, Forderung.
Zahlungen and Spenden already had the requested order. Across all three
tables, the date/amount-like columns now share one fixed width, the
status column is a third wider (it tends to hold longer label text),
and only the trailing description/reference column stretches to fill
the remaining space.

The Chronik pane now defaults to a third of the member view's width
instead of three fifths, matching the other panes.

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

src/ccma/ui/member_tab.py

@@ -37,11 +37,18 @@ from ccma.ui.messages import MessageAction, MessageBannerList, TabMessage
 from ccma.ui.payment_dialog import PaymentCreateDialog, PaymentEditDialog
 from ccma.ui.scrolling import ScrollableFrame
 
+# Shared column sizing for the ledger-style tables (Forderungen/Zahlungen/Spenden): date-
+# and amount-like columns get the same fixed width, status columns get a third more
+# (they tend to hold longer label text), and only the trailing description/reference
+# column stretches to take up whatever space remains.
+FIXED_COLUMN_WIDTH = 90
+STATUS_COLUMN_WIDTH = round(FIXED_COLUMN_WIDTH * 4 / 3)
+
 CLAIM_TABLE_COLUMNS = (
+    ("due", "Fällig", FIXED_COLUMN_WIDTH),
+    ("amount", "Betrag", FIXED_COLUMN_WIDTH),
+    ("status", "Status", STATUS_COLUMN_WIDTH),
     ("title", "Forderung", 220),
-    ("due", "Fällig", 100),
-    ("amount", "Betrag", 90),
-    ("status", "Status", 110),
 )
 
 
@@ -127,7 +134,7 @@ class MemberTab(ttk.Frame):
         self.details_pane = ttk.Frame(self.pane, padding=(0, 0, 10, 0))
         self.timeline_pane = ttk.Frame(self.pane, padding=(10, 0, 0, 0))
         self.pane.add(self.details_pane, weight=2)
-        self.pane.add(self.timeline_pane, weight=3)
+        self.pane.add(self.timeline_pane, weight=1)
         self._build_details(self.details_pane)
         self._build_timeline(self.timeline_pane)
         self._pane_position_initialized = False
@@ -139,7 +146,8 @@ class MemberTab(ttk.Frame):
         try:
             width = int(getattr(event, "width", 0)) or self.pane.winfo_width()
             if width > 1:
-                self.pane.sashpos(0, max(360, int(width * 0.4)))
+                # Chronik (timeline_pane) defaults to a third of the available width.
+                self.pane.sashpos(0, max(360, round(width * 2 / 3)))
                 self._pane_position_initialized = True
         except tk.TclError:
             return
@@ -283,13 +291,13 @@ class MemberTab(ttk.Frame):
             row=0, column=0, sticky="w", pady=(0, 10)
         )
         self.claims = ttk.Treeview(
-            contribution_tab, columns=("title", "due", "amount", "status"), show="headings"
+            contribution_tab, columns=("due", "amount", "status", "title"), show="headings"
         )
         self.claim_sort_column = "due"
         self.claim_sort_descending = False
         for key, title, width in CLAIM_TABLE_COLUMNS:
             self.claims.heading(key, text=title, command=lambda column=key: self._toggle_claim_sort(column))
-            self.claims.column(key, width=width, anchor="w")
+            self.claims.column(key, width=width, anchor="w", stretch=key == "title")
         self.claims.grid(row=1, column=0, sticky="nsew")
         self.claims.bind("<Double-1>", lambda _event: self._open_selected_claim())
         self.claims.bind("<Return>", lambda _event: self._open_selected_claim())
@@ -307,14 +315,14 @@ class MemberTab(ttk.Frame):
             selectmode="browse",
         )
         for key, title, width in (
-            ("date", "Datum", 100),
+            ("date", "Datum", FIXED_COLUMN_WIDTH),
-            ("amount", "Betrag", 90),
+            ("amount", "Betrag", FIXED_COLUMN_WIDTH),
-            ("allocated", "Zugeordnet", 90),
+            ("allocated", "Zugeordnet", FIXED_COLUMN_WIDTH),
-            ("available", "Frei", 90),
+            ("available", "Frei", FIXED_COLUMN_WIDTH),
             ("reference", "Referenz", 320),
         ):
             self.payments.heading(key, text=title)
-            self.payments.column(key, width=width, anchor="w")
+            self.payments.column(key, width=width, anchor="w", stretch=key == "reference")
         self.payments.grid(row=1, column=0, sticky="nsew")
         self.payments.bind("<Double-1>", lambda _event: self._edit_selected_payment())
         self.payments.bind("<Return>", lambda _event: self._edit_selected_payment())
@@ -347,15 +355,15 @@ class MemberTab(ttk.Frame):
             selectmode="browse",
         )
         for key, title, width in (
-            ("date", "Datum", 100),
+            ("date", "Datum", FIXED_COLUMN_WIDTH),
-            ("amount", "Betrag", 90),
+            ("amount", "Betrag", FIXED_COLUMN_WIDTH),
-            ("allocated", "Zugeordnet", 90),
+            ("allocated", "Zugeordnet", FIXED_COLUMN_WIDTH),
-            ("balance", "Offen", 90),
+            ("balance", "Offen", FIXED_COLUMN_WIDTH),
-            ("status", "Status", 150),
+            ("status", "Status", STATUS_COLUMN_WIDTH),
             ("reference", "Referenz / Zweck", 260),
         ):
             self.donations.heading(key, text=title)
-            self.donations.column(key, width=width, anchor="w")
+            self.donations.column(key, width=width, anchor="w", stretch=key == "reference")
         self.donations.grid(row=1, column=0, sticky="nsew")
         self.donations.bind("<Double-1>", lambda _event: self._edit_selected_donation())
         self.donations.bind("<Return>", lambda _event: self._edit_selected_donation())
@@ -602,10 +610,10 @@ class MemberTab(ttk.Frame):
                 "end",
                 iid=claim_id,
                 values=(
-                    claim.get("title", "Beitrag"),
                     format_date_for_display(str(claim.get("due_date", ""))),
                     money_text(claim_total(claim)),
                     CLAIM_STATUS_LABELS.get(status, status.upper()),
+                    claim.get("title", "Beitrag"),
                 ),
             )
         for payment in sorted(