Ensure consistent newline behavior in auto-height editors with JetBrains keymap (#47595)

Add an explicit `Editor && mode == auto_height` context block. This
ensures that `Shift+Enter` and `Ctrl+Enter` correctly insert a newline
at the cursor position in editors like the AI Agent Panel,
preventing them from inheriting conflicting overrides (e.g., JetBrains
mapping `Shift+Enter` to `editor::NewlineBelow`).

Closes #47269

Release Notes:

- Fixed an issue where `Shift+Enter` would insert a newline at the end
of the text instead of the cursor position in the Agent Panel when using
certain keymaps.

assets/keymaps/linux/jetbrains.json

@@ -81,6 +81,13 @@
       "ctrl-\\": "assistant::InlineAssist",
     },
   },
+  {
+    "context": "Editor && mode == auto_height",
+    "bindings": {
+      "shift-enter": "editor::Newline",
+      "ctrl-shift-enter": "editor::NewlineBelow",
+    },
+  },
   {
     "context": "BufferSearchBar",
     "bindings": {

assets/keymaps/macos/jetbrains.json

@@ -79,6 +79,13 @@
       "cmd-\\": "assistant::InlineAssist",
     },
   },
+  {
+    "context": "Editor && mode == auto_height",
+    "bindings": {
+      "shift-enter": "editor::Newline",
+      "ctrl-shift-enter": "editor::NewlineBelow",
+    },
+  },
   {
     "context": "BufferSearchBar",
     "bindings": {