hook up all the keyboard actions

src/input/Binding.zig

@@ -131,6 +131,13 @@ pub const Action = union(enum) {
     copy_to_clipboard: void,
     paste_from_clipboard: void,
 
+    /// Increase/decrease the font size by a certain amount
+    increase_font_size: u16,
+    decrease_font_size: u16,
+
+    /// Reset the font size to the original configured size
+    reset_font_size: void,
+
     /// Dev mode
     toggle_dev_mode: void,
 

src/input/key.zig

@@ -49,8 +49,22 @@ pub const Key = enum {
     y,
     z,
 
+    // numbers
+    zero,
+    one,
+    two,
+    three,
+    four,
+    five,
+    six,
+    seven,
+    eight,
+    nine,
+
     // other
     grave_accent, // `
+    minus,
+    equal,
 
     // control
     up,