实现输入框指令解析、高亮与补全。

让玩家与人设等占位在发送前可预览并正确展开。

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/directive-parse-web.test.ts

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+import { describe, expect, it } from "vitest";
+import { findDirectiveHits } from "../web/directive-parse.js";
+
+describe("findDirectiveHits (composer highlight)", () => {
+  it("marks @玩家 with persona preview (same as expand)", () => {
+    const hits = findDirectiveHits("且对@玩家没有因为", {
+      persona: { name: "林晚" },
+    });
+    expect(hits).toHaveLength(1);
+    expect(hits[0].raw).toBe("@玩家");
+    expect(hits[0].previewBody).toBe("发送时 → 林晚");
+  });
+
+  it("does not mark @玩家X (same as expand)", () => {
+    expect(
+      findDirectiveHits("@玩家X来了", { persona: { name: "林晚" } }),
+    ).toEqual([]);
+  });
+
+  it("marks dice without rolling", () => {
+    const hits = findDirectiveHits("检定 @rd100 30", {});
+    expect(hits).toHaveLength(1);
+    expect(hits[0].kind).toBe("dice");
+    expect(hits[0].raw).toBe("@rd100 30");
+    expect(hits[0].previewBody).toContain("发送时掷");
+    expect(hits[0].previewBody).toContain("点数届时生成");
+  });
+
+  it("ignores unknown @token", () => {
+    expect(findDirectiveHits("写给@某人", { persona: { name: "A" } })).toEqual(
+      [],
+    );
+  });
+});