feat: select mode widget style "fancy" or "plain" with descriptor arg

"fancy" mode is the previous behaviour and the default. "plain" mode makes the
mode widget use the same styling as other status bar widgets.

Select "plain" mode with a descriptor arg in the config. e.g:

`
bottom_bar "mode:plain file log selection diagnostics keybind branch linenumber clock spacer"
`

src/tui/status/modestate.zig

@@ -12,9 +12,16 @@ const Button = @import("../Button.zig");
 const tui = @import("../tui.zig");
 const CreateError = @import("widget.zig").CreateError;
 
-pub fn create(allocator: Allocator, parent: Plane, event_handler: ?EventHandler, _: ?[]const u8) CreateError!Widget {
-    return Button.create_widget(void, allocator, parent, .{
-        .ctx = {},
+const Style = enum {
+    plain,
+    fancy,
+};
+const default_style = .fancy;
+
+pub fn create(allocator: Allocator, parent: Plane, event_handler: ?EventHandler, arg: ?[]const u8) CreateError!Widget {
+    const style_ = if (arg) |str_style| std.meta.stringToEnum(Style, str_style) orelse default_style else default_style;
+    return Button.create_widget(Style, allocator, parent, .{
+        .ctx = style_,
         .label = tui.get_mode(),
         .on_click = on_click,
         .on_click2 = toggle_panel,
@@ -25,7 +32,7 @@ pub fn create(allocator: Allocator, parent: Plane, event_handler: ?EventHandler,
     });
 }
 
-pub fn layout(_: *void, btn: *Button.State(void)) Widget.Layout {
+pub fn layout(_: *Style, btn: *Button.State(Style)) Widget.Layout {
     const name = btn.plane.egc_chunk_width(tui.get_mode(), 0, 1);
     const logo = if (is_mini_mode() or is_overlay_mode()) 1 else btn.plane.egc_chunk_width(left ++ symbol ++ right, 0, 1);
     const padding: usize = 2;
@@ -41,9 +48,12 @@ fn is_overlay_mode() bool {
     return tui.input_mode_outer() != null;
 }
 
-pub fn render(_: *void, self: *Button.State(void), theme: *const Widget.Theme) bool {
+pub fn render(ctx: *Style, self: *Button.State(Style), theme: *const Widget.Theme) bool {
     const style_base = theme.statusbar;
-    const style_label = if (self.active) theme.editor_cursor else if (self.hover) theme.editor_selection else theme.statusbar_hover;
+    const style_label = switch (ctx.*) {
+        .fancy => if (self.active) theme.editor_cursor else if (self.hover) theme.editor_selection else theme.statusbar_hover,
+        .plain => if (self.active) theme.editor_cursor else if (self.hover or is_mini_mode()) theme.statusbar_hover else style_base,
+    };
     self.plane.set_base_style(theme.editor);
     self.plane.erase();
     self.plane.home();
@@ -68,7 +78,7 @@ pub fn render(_: *void, self: *Button.State(void), theme: *const Widget.Theme) b
     return false;
 }
 
-fn render_separator(self: *Button.State(void), theme: *const Widget.Theme) void {
+fn render_separator(self: *Button.State(Style), theme: *const Widget.Theme) void {
     self.plane.reverse_style();
     self.plane.set_base_style(.{ .bg = theme.editor.bg });
     if (theme.statusbar.bg) |bg| self.plane.set_style(.{ .bg = bg });
@@ -79,7 +89,7 @@ const left = " ";
 const symbol = "󱞏";
 const right = " ";
 
-fn render_logo(self: *Button.State(void), theme: *const Widget.Theme, style_label: Widget.Theme.Style) void {
+fn render_logo(self: *Button.State(Style), theme: *const Widget.Theme, style_label: Widget.Theme.Style) void {
     const style_braces: Widget.Theme.Style = if (tui.find_scope_style(theme, "punctuation")) |sty| .{ .fg = sty.style.fg, .bg = style_label.bg, .fs = style_label.fs } else style_label;
     if (left.len > 0) {
         self.plane.set_style(style_braces);
@@ -93,7 +103,7 @@ fn render_logo(self: *Button.State(void), theme: *const Widget.Theme, style_labe
     }
 }
 
-fn on_click(_: *void, _: *Button.State(void)) void {
+fn on_click(_: *Style, _: *Button.State(Style)) void {
     if (is_mini_mode()) {
         command.executeName("exit_mini_mode", .{}) catch {};
     } else if (is_overlay_mode()) {
@@ -103,6 +113,6 @@ fn on_click(_: *void, _: *Button.State(void)) void {
     }
 }
 
-fn toggle_panel(_: *void, _: *Button.State(void)) void {
+fn toggle_panel(_: *Style, _: *Button.State(Style)) void {
     command.executeName("toggle_panel", .{}) catch {};
 }