Assistant Panel: add keybinds for history and prompt library (#15486)

Release Notes:

- N/A

assets/keymaps/default-linux.json

@@ -149,7 +149,9 @@
     "bindings": {
       "ctrl-g": "search::SelectNextMatch",
       "ctrl-shift-g": "search::SelectPrevMatch",
-      "alt-m": "assistant::ToggleModelSelector"
+      "alt-m": "assistant::ToggleModelSelector",
+      "ctrl-k h": "assistant::DeployHistory",
+      "ctrl-k l": "assistant::DeployPromptLibrary"
     }
   },
   {

assets/keymaps/default-macos.json

@@ -186,7 +186,9 @@
     "bindings": {
       "cmd-g": "search::SelectNextMatch",
       "cmd-shift-g": "search::SelectPrevMatch",
-      "alt-m": "assistant::ToggleModelSelector"
+      "alt-m": "assistant::ToggleModelSelector",
+      "cmd-k h": "assistant::DeployHistory",
+      "cmd-k l": "assistant::DeployPromptLibrary"
     }
   },
   {