config: add progress-style option (#11289)

Adds progress-style config to control OSC 9;4 progress bar visibility.
Defaults to true, set false to hide.

Fixes #11241

AI Disclosure: Claude Code (Opus 4.6) used for codebase exploration,
code review, and testing assistance. All code written and reviewed by
hand.

src/apprt/gtk/class/surface.zig

@@ -1013,6 +1013,14 @@ pub const Surface = extern struct {
             priv.progress_bar_timer = null;
         }
 
+        if (priv.config) |config| {
+            if (!config.get().@"progress-style") {
+                log.debug("progress_report action blocked by config", .{});
+                priv.progress_bar_overlay.as(gtk.Widget).setVisible(@intFromBool(false));
+                return;
+            }
+        }
+
         const progress_bar = priv.progress_bar_overlay;
         switch (value.state) {
             // Remove the progress bar

src/config/Config.zig

@@ -3645,6 +3645,11 @@ else
 /// notifications using certain escape sequences such as OSC 9 or OSC 777.
 @"desktop-notifications": bool = true,
 
+/// If `true` (default), applications running in the terminal can show
+/// graphical progress bars using the ConEmu OSC 9;4 escape sequence.
+/// If `false`, progress bar sequences are silently ignored.
+@"progress-style": bool = true,
+
 /// Modifies the color used for bold text in the terminal.
 ///
 /// This can be set to a specific color, using the same format as