refactor: get zine watcher to build in flow

src/buffer/Manager.zig

@@ -241,3 +241,22 @@ pub fn buffer_from_ref(self: *Self, buffer_ref: usize) ?*Buffer {
 pub fn buffer_to_ref(_: *Self, buffer: *Buffer) usize {
     return @intFromPtr(buffer);
 }
+
+const watcher = @import("watcher");
+
+pub fn watch_all_buffers(self: *Self) watcher.Error!void {
+    var debouncer: watcher.Debouncer = .{};
+    var buffers: std.ArrayList([]const u8) = .empty;
+    var iter = self.buffers.keyIterator();
+    while (iter.next()) |key| {
+        (try buffers.addOne(self.allocator)).* = key.*;
+    }
+
+    var watcher_: watcher.Watcher = try .init(
+        self.allocator,
+        &debouncer,
+        &.{}, // dirs_to_watch.items,
+    );
+
+    try watcher_.start();
+}