Add support for creating a new empty buffer (C-k i).

- Introduced `BufferNew` command to create and switch to a new unnamed buffer.
- Registered `BufferNew` in the command registry and updated keymap and help text.
- Implemented `cmd_buffer_new()` to handle buffer creation and switching logic.

Command.cc

@@ -1585,6 +1585,19 @@ cmd_buffer_close(const CommandContext &ctx)
 }
 
 
+// Create a new empty, unnamed buffer and switch to it
+static bool
+cmd_buffer_new(const CommandContext &ctx)
+{
+	// Create an empty buffer and add it to the editor
+	Buffer empty;
+	std::size_t idx = ctx.editor.AddBuffer(std::move(empty));
+	ctx.editor.SwitchTo(idx);
+	ctx.editor.SetStatus("New buffer");
+	return true;
+}
+
+
 // --- Editing ---
 static bool
 cmd_insert_text(CommandContext &ctx)
@@ -4378,6 +4391,7 @@ InstallDefaultCommands()
 		CommandId::BufferSwitchStart, "buffer-switch-start", "Begin buffer switch prompt",
 		cmd_buffer_switch_start, false, false
 	});
+	CommandRegistry::Register({CommandId::BufferNew, "buffer-new", "Open new empty buffer", cmd_buffer_new});
 	CommandRegistry::Register({CommandId::BufferNext, "buffer-next", "Switch to next buffer", cmd_buffer_next});
 	CommandRegistry::Register({CommandId::BufferPrev, "buffer-prev", "Switch to previous buffer", cmd_buffer_prev});
 	CommandRegistry::Register({

Command.h

@@ -31,6 +31,7 @@ enum class CommandId {
 	VisualFontPickerToggle,
 	// Buffers
 	BufferSwitchStart, // begin buffer switch prompt
+	BufferNew, // create a new empty, unnamed buffer (C-k i)
 	BufferClose,
 	BufferNext,
 	BufferPrev,

HelpText.cc

@@ -31,6 +31,7 @@ HelpText::Text()
 		"  C-k c        Close current buffer\n"
 		"  C-k d        Kill to end of line\n"
 		"  C-k e        Open file (prompt)\n"
+		"  C-k i        New empty buffer\n"
 		"  C-k f        Flush kill ring\n"
 		"  C-k g        Jump to line\n"
 		"  C-k h        Show this help\n"

KKeymap.cc

@@ -42,6 +42,9 @@ KLookupKCommand(const int ascii_key, const bool ctrl, CommandId &out) -> bool
 	case 'a':
 		out = CommandId::MarkAllAndJumpEnd;
 		return true;
+	case 'i':
+		out = CommandId::BufferNew; // C-k i new empty buffer
+		return true;
 	case 'k':
 		out = CommandId::CenterOnCursor; // C-k k center current line
 		return true;