feat: add interactive and non-interactive commands to set the current buffer's tab_width

src/tui/mode/mini/tab_width.zig

@@ -0,0 +1,16 @@
+const command = @import("command");
+
+pub const Type = @import("numeric_input.zig").Create(@This());
+pub const create = Type.create;
+
+pub fn name(_: *Type) []const u8 {
+    return " tab size";
+}
+
+pub const preview = goto;
+pub const apply = goto;
+pub const cancel = goto;
+
+fn goto(self: *Type) void {
+    command.executeName("set_tab_width", command.fmt(.{self.input orelse self.start})) catch {};
+}