spawn Claude in fullscreen mode and route mouse-wheel to PgUp/PgDown

Spawn `claude` directly as the tmux command with
CLAUDE_CODE_NO_FLICKER=1 so Claude Code runs in its fullscreen TUI
mode (input box pinned at bottom, owns its own scrollback). Mouse
wheel events are converted to PgUp/PgDown key input — universal
scroll signal that Claude, less, vim normal mode all respect, and
sidesteps the mouse-mode-but-no-scroll dead end where TUI apps
capture mouse without binding the wheel.

Drops the 1000-row tmux canvas + SingleChildScrollView experiment
in favor of viewport-sized tmux and Claude's native bottom-pinning.

Makefile install target now kills the clide tmux server so the
new config takes effect immediately. Marked TEMP — to be removed
once we no longer need the rapid-iteration loop.

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

lib/src/terminal/src/terminal_view.dart

@@ -174,18 +174,14 @@ class TerminalViewState extends State<TerminalView> {
     if (event is! PointerScrollEvent) return;
     final lh = renderTerminal.lineHeight;
     if (lh <= 0) return;
-    final position = renderTerminal.getCellOffset(event.localPosition);
     final lines = (event.scrollDelta.dy / lh).round().clamp(-5, 5);
+    // Always send PgUp/PgDown for scroll — the mouse-escape-sequence
+    // path tends to be a no-op in TUI apps (claude, vim) that capture
+    // mouse for other purposes. PgUp/PgDown is the universal scroll.
     for (var i = 0; i < lines.abs(); i++) {
-      final up = lines < 0;
-      final handled = widget.terminal.mouseInput(
-        up ? TerminalMouseButton.wheelUp : TerminalMouseButton.wheelDown,
-        TerminalMouseButtonState.down,
-        position,
+      widget.terminal.keyInput(
+        lines < 0 ? TerminalKey.pageUp : TerminalKey.pageDown,
       );
-      if (!handled && widget.simulateScroll) {
-        widget.terminal.keyInput(up ? TerminalKey.arrowUp : TerminalKey.arrowDown);
-      }
     }
   }