Improve terminal theming, cursor UX, and size negotiation

src/terminal_view.h

@@ -6,6 +6,8 @@
 #include <array>
 
 class QKeyEvent;
+class QFocusEvent;
+class QResizeEvent;
 
 class TerminalView : public QTextEdit
 {
@@ -20,9 +22,12 @@ public:
 
 signals:
     void inputGenerated(const QString& input);
+    void terminalSizeChanged(int columns, int rows);
 
 protected:
     void keyPressEvent(QKeyEvent* event) override;
+    void focusInEvent(QFocusEvent* event) override;
+    void resizeEvent(QResizeEvent* event) override;
 
 private:
     struct ThemePalette {
@@ -51,6 +56,9 @@ private:
     void handleSgrSequence(const QString& params);
     void appendTextChunk(const QString& text);
     QColor paletteColor(bool background, int index, bool bright) const;
+    int terminalColumns() const;
+    int terminalRows() const;
+    void emitTerminalSize();
 };
 
 #endif