refactor: improve keybindings for cross-platform compatibility

- Use ctrl-shift-c/v/k pattern (Windows Terminal style) for copy/paste/clear

- Add ctrl-shift- as alternative open terminal binding

- Keep cmd-w for close (standard Mac shortcut)

- Add menu items for all terminal commands with availability checks

Author: Juan C. Carvajal B.

keymaps/terminal.json

@@ -1,11 +1,12 @@
 {
   "atom-workspace": {
-    "cmd-shift-t": "terminal:open"
+    "cmd-shift-t": "terminal:open",
+    "ctrl-shift-`": "terminal:open"
   },
   "terminal-view": {
-    "cmd-c": "terminal:copy",
-    "cmd-v": "terminal:paste",
-    "cmd-k": "terminal:clear",
+    "ctrl-shift-c": "terminal:copy",
+    "ctrl-shift-v": "terminal:paste",
+    "ctrl-shift-k": "terminal:clear",
     "cmd-w": "terminal:close"
   }
 }

menus/terminal.json

@@ -9,6 +9,29 @@
             {
               "label": "Open Terminal",
               "command": "terminal:open"
+            },
+            {
+              "label": "Copy",
+              "command": "terminal:copy",
+              "available": "terminal-view"
+            },
+            {
+              "label": "Paste",
+              "command": "terminal:paste",
+              "available": "terminal-view"
+            },
+            {
+              "label": "Clear",
+              "command": "terminal:clear",
+              "available": "terminal-view"
+            },
+            {
+              "type": "separator"
+            },
+            {
+              "label": "Close",
+              "command": "terminal:close",
+              "available": "terminal-view"
             }
           ]
         }