Abbreviations that are a subset of others are eaten

For instance: the leading `g` in `gph` will be eaten by a `g` abbreviation.

A possible fix is to allow a time period for abbreviations to complete. For instance, `gph` will resolve after 500ms rather than `g` resolving instantly.

使用 `gph` 重现缩写行为，确认前导 `g` 缩写会在更长的缩写能够解析之前被消费。跟踪缩写处理的入口点，并确定当前如何触发补全；完成标准是 `gph` 作为整体解析，同时独立的 `g` 仍然有效，并通过回归检查验证该行为。

由索引模型根据 Issue 内容生成。