Session UX: inline password prompt and terminal font size controls

Replace the modal RDP/SSH password dialog with an inline prompt bar
embedded in the session tab instead of a separate popup window. Add
per-tab terminal font size controls (increase/decrease/reset/set
exact point size) via the tab context menu, with the chosen size
persisted across sessions.

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

src/terminal_view.cpp

@@ -52,6 +52,14 @@ void TerminalView::setThemeName(const QString& themeName)
     applyThemePalette(paletteByName(themeName));
 }
 
+void TerminalView::setFontPointSize(int pointSize)
+{
+    QFont updatedFont = font();
+    updatedFont.setPointSize(pointSize);
+    setFont(updatedFont);
+    emitTerminalSize();
+}
+
 void TerminalView::appendTerminalData(const QString& data)
 {
     if (data.isEmpty()) {