refactor: zigify imports and correct minor mistakes

src/cell.zig

@@ -1,11 +1,8 @@
-const std = @import("std");
-const Style = @import("style.zig");
+//! Cell type containing content and formatting for each character in the terminal screen.
 
-pub const Cell = @This();
-
-style: Style = .{ .emphasis = &.{} },
 // TODO embrace `zg` dependency more due to utf-8 encoding
 cp: u21 = ' ',
+style: Style = .{ .emphasis = &.{} },
 
 pub fn eql(this: Cell, other: Cell) bool {
     return this.cp == other.cp and this.style.eql(other.style);
@@ -20,6 +17,10 @@ pub fn value(this: Cell, writer: anytype) !void {
     try this.style.value(writer, this.cp);
 }
 
+const std = @import("std");
+const Style = @import("style.zig");
+const Cell = @This();
+
 test "ascii styled text" {
     const cells: [4]Cell = .{
         .{ .cp = 'Y', .style = .{ .fg = .green, .bg = .grey, .emphasis = &.{} } },