refactor: remove unused stream handler scroll-to-bottom code

The renderer approach doesn't need termio changes.

Co-Authored-By: Sachin <sachinbeniwal0101@gmail.com>

src/Surface.zig

@@ -1076,8 +1076,6 @@ pub fn handleMessage(self: *Surface, msg: Message) !void {
             }, .unlocked);
         },
 
-        .report_color_scheme => |force| self.reportColorScheme(force),
-
         .present_surface => try self.presentSurface(),
 
         .password_input => |v| try self.passwordInput(v),

src/termio/Termio.zig

@@ -166,7 +166,6 @@ pub const DerivedConfig = struct {
     clipboard_write: configpkg.ClipboardAccess,
     enquiry_response: []const u8,
     conditional_state: configpkg.ConditionalState,
-    scroll_to_bottom: configpkg.Config.ScrollToBottom,
 
     pub fn init(
         alloc_gpa: Allocator,
@@ -208,7 +207,6 @@ pub const DerivedConfig = struct {
             .clipboard_write = config.@"clipboard-write",
             .enquiry_response = try alloc.dupe(u8, config.@"enquiry-response"),
             .conditional_state = config._conditional_state,
-            .scroll_to_bottom = config.@"scroll-to-bottom",
 
             // This has to be last so that we copy AFTER the arena allocations
             // above happen (Zig assigns in order).
@@ -303,7 +301,6 @@ pub fn init(self: *Termio, alloc: Allocator, opts: termio.Options) !void {
         .enquiry_response = opts.config.enquiry_response,
         .default_cursor_style = opts.config.cursor_style,
         .default_cursor_blink = opts.config.cursor_blink,
-        .scroll_to_bottom_on_output = opts.config.scroll_to_bottom.output,
     };
 
     const thread_enter_state = try ThreadEnterState.create(

src/termio/stream_handler.zig

@@ -56,9 +56,6 @@ pub const StreamHandler = struct {
     /// The clipboard write access configuration.
     clipboard_write: configpkg.ClipboardAccess,
 
-    /// The scroll-to-bottom behavior configuration.
-    scroll_to_bottom_on_output: bool,
-
     //---------------------------------------------------------------
     // Internal state
 
@@ -115,7 +112,6 @@ pub const StreamHandler = struct {
         self.enquiry_response = config.enquiry_response;
         self.default_cursor_style = config.cursor_style;
         self.default_cursor_blink = config.cursor_blink;
-        self.scroll_to_bottom_on_output = config.scroll_to_bottom.output;
 
         // If our cursor is the default, then we update it immediately.
         if (self.default_cursor) self.setCursorStyle(.default) catch |err| {
@@ -580,11 +576,6 @@ pub const StreamHandler = struct {
         // Small optimization: call index instead of linefeed because they're
         // identical and this avoids one layer of function call overhead.
         try self.terminal.index();
-
-        // If configured, scroll to bottom on output so the user sees new content
-        if (self.scroll_to_bottom_on_output) {
-            try self.terminal.scrollViewport(.bottom);
-        }
     }
 
     pub inline fn reverseIndex(self: *StreamHandler) !void {