Arrow keys work without Fn outside Text Entry

; . , / are arrows on their own unless the foreground App is editing
text (App::textEntryActive); Fn + those keys are arrows everywhere.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT

lib/input/src/key_mapper.h

@@ -22,12 +22,17 @@ struct RawKeys {
 };
 
 // Turns keyboard state changes into logical KeyEvents: only newly pressed keys produce events;
-// Fn + ; . , / are arrows; ` is Back and Fn + ` is Home; the Compose Key (opt) followed by an
-// accent and a letter types the accented letter (opt ' e -> é).
+// Fn + ; . , / are arrows, and so are ; . , / alone when no text is being entered; ` is Back and
+// Fn + ` is Home; the Compose Key (opt) followed by an accent and a letter types the accented
+// letter (opt ' e -> é).
 class KeyMapper {
    public:
     std::vector<KeyEvent> update(const RawKeys& keys);
 
+    // Whether the foreground App is editing text (default). Outside text entry, the arrow keys
+    // don't need Fn.
+    void setTextEntry(bool active) { textEntry_ = active; }
+
     // 0 when idle, '*' when opt was pressed, or the accent character waiting for its letter.
     char pendingCompose() const { return compose_; }
 
@@ -36,6 +41,7 @@ class KeyMapper {
 
     RawKeys previous_;
     char compose_ = 0;
+    bool textEntry_ = true;
 };
 
 }  // namespace roro