feat: user-resizable panes with persisted layout

- Horizontal splitter between the server list and the editor panel
- Vertical splitter between the Active and Disabled tables (drops the
  fixed 170px cap on the disabled list)
- Editor fields (args, env/header tables) now grow with the window
  instead of being pinned to fixed max heights
- Splitter positions and window geometry persist across launches via
  QSettings; handles highlight on hover/drag

bcc.py

@@ -13,7 +13,7 @@ from __future__ import annotations
 import sys
 from pathlib import Path
 
-from PySide6.QtCore import Qt, QThread, QTimer, Signal
+from PySide6.QtCore import QSettings, Qt, QThread, QTimer, Signal
 from PySide6.QtGui import QAction, QColor, QGuiApplication
 from PySide6.QtWidgets import (
     QAbstractItemView,
@@ -33,6 +33,7 @@ from PySide6.QtWidgets import (
     QMessageBox,
     QPlainTextEdit,
     QPushButton,
+    QSplitter,
     QStackedWidget,
     QTableWidget,
     QTableWidgetItem,
@@ -98,6 +99,9 @@ QTableWidget#disabledTable::item:selected {{ background: {ACCENT}; color: #1a120
 QPlainTextEdit#diag {{ font-family: "SF Mono", "Cascadia Code", "Consolas", "DejaVu Sans Mono", monospace;
     font-size: 12px; background: #16181d; border: 1px solid {BORDER}; border-radius: 8px; }}
 QFrame#diagCard {{ background: transparent; border: none; }}
+QSplitter::handle {{ background: transparent; }}
+QSplitter::handle:hover {{ background: {BORDER}; border-radius: 4px; }}
+QSplitter::handle:pressed {{ background: {ACCENT}; border-radius: 4px; }}
 """
 
 
@@ -136,9 +140,9 @@ class KeyValueTable(QWidget):
         self.table.horizontalHeader().setSectionResizeMode(1, QHeaderView.ResizeMode.Stretch)
         self.table.verticalHeader().setVisible(False)
         self.table.setSelectionBehavior(QAbstractItemView.SelectionBehavior.SelectRows)
-        self.table.setMaximumHeight(150)
+        self.table.setMinimumHeight(90)
         self.table.itemChanged.connect(self._changed)
-        lay.addWidget(self.table)
+        lay.addWidget(self.table, 1)
         row = QHBoxLayout()
         add = QPushButton("+ Add")
         rem = QPushButton("− Remove")
@@ -281,7 +285,7 @@ class ServerEditor(QFrame):
         self.stack = QStackedWidget()
         self.stack.addWidget(self._build_stdio_page())
         self.stack.addWidget(self._build_remote_page())
-        outer.addWidget(self.stack)
+        outer.addWidget(self.stack, 1)
 
         # Dependency status row
         dep = QHBoxLayout()
@@ -329,7 +333,6 @@ class ServerEditor(QFrame):
         dlay.addLayout(crow)
         self.diag_card.setVisible(False)
         outer.addWidget(self.diag_card)
-        outer.addStretch()
 
         self.setEnabled(False)
 
@@ -353,14 +356,14 @@ class ServerEditor(QFrame):
         self.args.setPlaceholderText(
             "-y\n@modelcontextprotocol/server-filesystem\n/Users/you/Documents"
         )
-        self.args.setMaximumHeight(120)
+        self.args.setMinimumHeight(70)
         self.args.textChanged.connect(self._emit)
-        v.addWidget(self.args)
+        v.addWidget(self.args, 1)
         v.addWidget(self._lbl("Environment variables"))
         self.env = KeyValueTable(
             "Variable", "Value", on_change=self._emit, before_change=self._before_change
         )
-        v.addWidget(self.env)
+        v.addWidget(self.env, 1)
         return w
 
     def _build_remote_page(self):
@@ -382,7 +385,7 @@ class ServerEditor(QFrame):
         self.headers = KeyValueTable(
             "Header", "Value", on_change=self._emit, before_change=self._before_change
         )
-        v.addWidget(self.headers)
+        v.addWidget(self.headers, 1)
         return w
 
     # --- model <-> form -------------------------------------------------- #
@@ -655,12 +658,18 @@ class MainWindow(QMainWindow):
 
         root.addLayout(self._build_topbar())
 
-        split = QHBoxLayout()
+        # User-draggable divider between the server list and the editor.
-        split.setSpacing(12)
+        split = QSplitter(Qt.Orientation.Horizontal)
-        split.addWidget(self._build_left(), 3)
+        split.setChildrenCollapsible(False)
+        split.setHandleWidth(10)
+        split.addWidget(self._build_left())
         self.editor = ServerEditor(on_change=self._editor_changed, before_change=self._push_undo)
-        split.addWidget(self.editor, 4)
+        split.addWidget(self.editor)
-        root.addLayout(split, 1)
+        split.setStretchFactor(0, 3)
+        split.setStretchFactor(1, 4)
+        split.setSizes([390, 520])
+        self.hsplit = split
+        root.addWidget(split, 1)
 
         root.addLayout(self._build_actionbar())
 
@@ -668,8 +677,25 @@ class MainWindow(QMainWindow):
         self.status.setObjectName("statusbar")
         root.addWidget(self.status)
 
+        self._restore_layout()
         self.reload_profiles()
 
+    # --- layout persistence ---------------------------------------------- #
+    def _restore_layout(self):
+        st = QSettings("BCC", "BetterClaudeConfig")
+        if geo := st.value("window/geometry"):
+            self.restoreGeometry(geo)
+        if hs := st.value("window/hsplit"):
+            self.hsplit.restoreState(hs)
+        if vs := st.value("window/vsplit"):
+            self.vsplit.restoreState(vs)
+
+    def _save_layout(self):
+        st = QSettings("BCC", "BetterClaudeConfig")
+        st.setValue("window/geometry", self.saveGeometry())
+        st.setValue("window/hsplit", self.hsplit.saveState())
+        st.setValue("window/vsplit", self.vsplit.saveState())
+
     # --- top bar --------------------------------------------------------- #
     def _build_topbar(self):
         bar = QHBoxLayout()
@@ -722,27 +748,48 @@ class MainWindow(QMainWindow):
         head.setObjectName("h1")
         v.addWidget(head)
 
+        # Active and Disabled sections live in a vertical splitter so the user
+        # can drag the divider instead of being stuck with a fixed-height
+        # disabled list.
+        active_box = QWidget()
+        av = QVBoxLayout(active_box)
+        av.setContentsMargins(0, 0, 0, 0)
+        av.setSpacing(8)
         self.active_label = QLabel("Active")
         self.active_label.setObjectName("section")
-        v.addWidget(self.active_label)
+        av.addWidget(self.active_label)
         self.active_table = self._make_server_table()
-        v.addWidget(self.active_table, 3)
+        av.addWidget(self.active_table, 1)
         self.active_empty = QLabel("No active servers. Add one, or Paste JSON.")
         self.active_empty.setObjectName("placeholder")
         self.active_empty.setAlignment(Qt.AlignmentFlag.AlignCenter)
         self.active_empty.hide()
-        v.addWidget(self.active_empty)
+        av.addWidget(self.active_empty)
 
+        disabled_box = QWidget()
+        dv = QVBoxLayout(disabled_box)
+        dv.setContentsMargins(0, 0, 0, 0)
+        dv.setSpacing(8)
         self.disabled_label = QLabel("⊘  Disabled")
         self.disabled_label.setObjectName("sectionDisabled")
-        v.addWidget(self.disabled_label)
+        dv.addWidget(self.disabled_label)
         self.disabled_table = self._make_server_table(object_name="disabledTable")
-        self.disabled_table.setMaximumHeight(170)
+        dv.addWidget(self.disabled_table, 1)
-        v.addWidget(self.disabled_table, 1)
         self.disabled_empty = QLabel("Nothing disabled.")
         self.disabled_empty.setObjectName("placeholder")
         self.disabled_empty.setAlignment(Qt.AlignmentFlag.AlignCenter)
-        v.addWidget(self.disabled_empty)
+        dv.addWidget(self.disabled_empty)
+
+        vsplit = QSplitter(Qt.Orientation.Vertical)
+        vsplit.setChildrenCollapsible(False)
+        vsplit.setHandleWidth(10)
+        vsplit.addWidget(active_box)
+        vsplit.addWidget(disabled_box)
+        vsplit.setStretchFactor(0, 3)
+        vsplit.setStretchFactor(1, 1)
+        vsplit.setSizes([360, 150])
+        self.vsplit = vsplit
+        v.addWidget(vsplit, 1)
         return card
 
     # --- bottom action bar ---------------------------------------------- #
@@ -1255,6 +1302,7 @@ class MainWindow(QMainWindow):
         if self.dirty and not self._confirm_discard():
             e.ignore()
             return
+        self._save_layout()
         e.accept()