feat: M-F/M-B (Alt+Shift+f/b) で選択しながら単語移動を追加

- M-F: 選択しながら次の単語へ移動
- M-B: 選択しながら前の単語へ移動
- M-f/M-b (小文字): 選択を解除して移動

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: sanohiro

build.zig.zon

@@ -1,6 +1,6 @@
 .{
     .name = .ze,
-    .version = "0.7.5",
+    .version = "0.7.6",
     .fingerprint = 0xa9d116540b6957d2,
     .paths = .{""},
 }

src/commands/movement.zig

@@ -381,6 +381,18 @@ pub fn selectPageDown(e: *Editor) !void {
     pageScroll(e, .down);
 }
 
+/// M-F (Alt+Shift+f): 選択しながら次の単語へ移動
+pub fn selectForwardWord(e: *Editor) !void {
+    ensureMark(e);
+    try forwardWord(e);
+}
+
+/// M-B (Alt+Shift+b): 選択しながら前の単語へ移動
+pub fn selectBackwardWord(e: *Editor) !void {
+    ensureMark(e);
+    try backwardWord(e);
+}
+
 // ========================================
 // ヘルパー関数
 // ========================================

src/editor.zig

@@ -2207,6 +2207,10 @@ pub const Editor = struct {
                 }
             },
             .alt => |c| {
+                // 小文字のM-f, M-bは選択解除（大文字のM-F, M-Bは選択維持）
+                if (c == 'f' or c == 'b') {
+                    self.getCurrentWindow().mark_pos = null;
+                }
                 // keymapから検索
                 if (self.keymap.findAlt(c)) |handler| {
                     try handler(self);

src/keymap.zig

@@ -177,6 +177,10 @@ pub const Keymap = struct {
         try self.bindAlt('b', movement.backwardWord);
         try self.bindAlt('d', edit.deleteWord);
 
+        // 選択しながら単語移動 (Alt+Shift+f/b = M-F/B)
+        try self.bindAlt('F', movement.selectForwardWord);
+        try self.bindAlt('B', movement.selectBackwardWord);
+
         // コピー
         try self.bindAlt('w', edit.copyRegion);