Change Fit All to Fit Selection with Select All shortcut

- F key now fits to selected nodes (or all if none selected)
- A key selects all nodes
- Workflow: drag-select nodes then F to zoom, or A then F for all
- Updated help banner and context menu
- Context menu now has Select All (A) and Fit Selection (F)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/cmdforge/gui/widgets/flow_graph.py

@@ -163,7 +163,8 @@ class FlowGraphWidget(QWidget):
             "Zoom: Scroll wheel  |  "
             "Select: Click or drag box  |  "
             "Edit: Double-click  |  "
-            "Fit All: F"
+            "Select All: A  |  "
+            "Fit Selection: F"
         )
         self._help_banner.setStyleSheet("""
             QLabel {
@@ -294,25 +295,41 @@ class FlowGraphWidget(QWidget):
             # Clear selection
             self._graph.clear_selection()
 
-    def fit_all_nodes(self):
-        """Fit view to show all nodes."""
+    def select_all_nodes(self):
+        """Select all nodes in the graph."""
         if not self._graph:
             return
 
         all_nodes = self._graph.all_nodes()
-        if not all_nodes:
-            return
-
-        # Select all, fit, then clear selection
         for node in all_nodes:
             node.set_selected(True)
-        self._graph.fit_to_selection()
-        self._graph.clear_selection()
+
+    def fit_selection(self):
+        """Fit view to show selected nodes (or all if none selected)."""
+        if not self._graph:
+            return
+
+        selected = self._graph.selected_nodes()
+        if not selected:
+            # No selection - fit all nodes
+            all_nodes = self._graph.all_nodes()
+            if not all_nodes:
+                return
+            for node in all_nodes:
+                node.set_selected(True)
+            self._graph.fit_to_selection()
+            self._graph.clear_selection()
+        else:
+            # Fit to current selection (don't clear it)
+            self._graph.fit_to_selection()
 
     def keyPressEvent(self, event: QKeyEvent):
         """Handle keyboard shortcuts."""
         if event.key() == Qt.Key_F:
-            self.fit_all_nodes()
+            self.fit_selection()
+            event.accept()
+        elif event.key() == Qt.Key_A:
+            self.select_all_nodes()
             event.accept()
         else:
             super().keyPressEvent(event)
@@ -324,10 +341,14 @@ class FlowGraphWidget(QWidget):
         QTimer.singleShot(100, self._show_help_banner)
 
     def eventFilter(self, obj, event):
-        """Filter events from the graph widget to catch F key and focus."""
-        if event.type() == QEvent.KeyPress and event.key() == Qt.Key_F:
-            self.fit_all_nodes()
-            return True  # Event handled
+        """Filter events from the graph widget to catch keyboard shortcuts."""
+        if event.type() == QEvent.KeyPress:
+            if event.key() == Qt.Key_F:
+                self.fit_selection()
+                return True  # Event handled
+            elif event.key() == Qt.Key_A:
+                self.select_all_nodes()
+                return True  # Event handled
         elif event.type() == QEvent.Enter:
             # Show banner when mouse enters the graph area
             self._show_help_banner()
@@ -372,8 +393,12 @@ class FlowGraphWidget(QWidget):
         """Show context menu."""
         menu = QMenu(self._graph.widget)
 
-        fit_action = QAction("Fit All (F)", menu)
-        fit_action.triggered.connect(self.fit_all_nodes)
+        select_all_action = QAction("Select All (A)", menu)
+        select_all_action.triggered.connect(self.select_all_nodes)
+        menu.addAction(select_all_action)
+
+        fit_action = QAction("Fit Selection (F)", menu)
+        fit_action.triggered.connect(self.fit_selection)
         menu.addAction(fit_action)
 
         menu.exec_(self._graph.widget.mapToGlobal(pos))