docs: documenting PASTE/COPY/CUT keycodes on macOS (#3058)

* Testing PASTE/COPY/CUT on macOS

Testing using ZMK Studio v0.3.1 to send these keys.

Using Karabiner-EventViewer, nothing from C_AC_CUT, C_AC_COPY, C_AC_PASTE, nor from paste special which I assume would be called C_AC_PASTE_SPECIAL (while for example C_AC_SEARCH was detected).

Did see K_CUT, K_COPY, K_PASTE, but they appear to do nothing by default.

* Add macOS footnote for editing keys K_CUT, K_COPY, K_PASTE

* Add macOS testing for K_UNDO, K_REDO etc.

    C_AC_UNDO - not even registering as a keypress

    K_UNDO - detected as a keypress, but no effect. Does not act like command+z

    C_AC_REDO - not even registering as a keypress

    K_AGAIN aka K_REDO - detected as a keypress, but no effect. Does not act like shift+command+z

* None of the six 'Input Assist' consumer keys work on macOS

Testing using ZMK Studio v0.3.1 to send these keys with macOS 15.6.1 (ARM),
and watching for keypresses with Karabiner-EventViewer v15.5.0.

docs/docs/keymaps/_footnotes/macos-editing.mdx

@@ -0,0 +1,2 @@
+On macOS, `K_CUT`, `K_COPY`, and `K_PASTE` are recognized as key presses,
+but do nothing by default.

docs/docs/keymaps/_footnotes/macos-undo-redo.mdx

@@ -0,0 +1,2 @@
+On macOS, `K_UNDO` and `K_REDO` are recognized as key presses,
+but do nothing by default.

docs/src/data/footnotes.js

@@ -7,13 +7,17 @@
 import example from "@site/docs/keymaps/_footnotes/example.mdx";
 import iosApplication from "@site/docs/keymaps/_footnotes/ios-application.mdx";
 import iosPower from "@site/docs/keymaps/_footnotes/ios-power.mdx";
+import macosEditing from "@site/docs/keymaps/_footnotes/macos-editing.mdx";
 import macosPower from "@site/docs/keymaps/_footnotes/macos-power.mdx";
+import macosUndoRedo from "@site/docs/keymaps/_footnotes/macos-undo-redo.mdx";
 import globe from "@site/docs/keymaps/_footnotes/globe.mdx";
 
 export default {
   example,
   iosApplication,
   iosPower,
+  macosEditing,
   macosPower,
+  macosUndoRedo,
   globe,
 };

docs/src/data/hid.js

@@ -3092,10 +3092,12 @@ export default [
       windows: false,
       linux: true,
       android: false,
-      macos: null,
+      macos: true,
       ios: null,
     },
-    footnotes: {},
+    footnotes: {
+      macos: ["macosEditing"],
+    },
   },
   {
     names: ["K_UNDO"],
@@ -3113,10 +3115,12 @@ export default [
       windows: false,
       linux: true,
       android: false,
-      macos: null,
+      macos: true,
       ios: null,
     },
-    footnotes: {},
+    footnotes: {
+      macos: ["macosEditing"],
+    },
   },
   {
     names: ["K_CUT"],
@@ -3134,10 +3138,12 @@ export default [
       windows: false,
       linux: true,
       android: false,
-      macos: null,
+      macos: true,
       ios: null,
     },
-    footnotes: {},
+    footnotes: {
+      macos: ["macosEditing"],
+    },
   },
   {
     names: ["K_COPY"],
@@ -3155,10 +3161,12 @@ export default [
       windows: false,
       linux: true,
       android: false,
-      macos: null,
+      macos: true,
       ios: null,
     },
-    footnotes: {},
+    footnotes: {
+      macos: ["macosEditing"],
+    },
   },
   {
     names: ["K_PASTE"],
@@ -3176,10 +3184,12 @@ export default [
       windows: false,
       linux: true,
       android: false,
-      macos: null,
+      macos: true,
       ios: null,
     },
-    footnotes: {},
+    footnotes: {
+      macos: ["macosEditing"],
+    },
   },
   {
     names: ["K_FIND"],
@@ -7146,7 +7156,7 @@ export default [
       windows: false,
       linux: true,
       android: false,
-      macos: null,
+      macos: false,
       ios: null,
     },
     footnotes: {},
@@ -7167,7 +7177,7 @@ export default [
       windows: false,
       linux: true,
       android: false,
-      macos: null,
+      macos: false,
       ios: null,
     },
     footnotes: {},
@@ -7188,7 +7198,7 @@ export default [
       windows: false,
       linux: true,
       android: false,
-      macos: null,
+      macos: false,
       ios: null,
     },
     footnotes: {},
@@ -7209,7 +7219,7 @@ export default [
       windows: false,
       linux: true,
       android: false,
-      macos: null,
+      macos: false,
       ios: null,
     },
     footnotes: {},
@@ -7629,7 +7639,7 @@ export default [
       windows: false,
       linux: true,
       android: false,
-      macos: null,
+      macos: false,
       ios: null,
     },
     footnotes: {},
@@ -7755,7 +7765,7 @@ export default [
       windows: null,
       linux: true,
       android: null,
-      macos: null,
+      macos: false,
       ios: null,
     },
     footnotes: {},
@@ -7776,7 +7786,7 @@ export default [
       windows: null,
       linux: true,
       android: null,
-      macos: null,
+      macos: false,
       ios: null,
     },
     footnotes: {},
@@ -7797,7 +7807,7 @@ export default [
       windows: null,
       linux: true,
       android: null,
-      macos: null,
+      macos: false,
       ios: null,
     },
     footnotes: {},
@@ -7818,7 +7828,7 @@ export default [
       windows: null,
       linux: true,
       android: null,
-      macos: null,
+      macos: false,
       ios: null,
     },
     footnotes: {},
@@ -7839,7 +7849,7 @@ export default [
       windows: null,
       linux: true,
       android: null,
-      macos: null,
+      macos: false,
       ios: null,
     },
     footnotes: {},
@@ -7860,7 +7870,7 @@ export default [
       windows: null,
       linux: true,
       android: null,
-      macos: null,
+      macos: false,
       ios: null,
     },
     footnotes: {},