fix(grid): avoid repeated search text allocations

apps/desktop/src/composables/__tests__/useDataGridSearch.spec.ts

@@ -5,19 +5,34 @@ import { useDataGridSearch } from "@/composables/useDataGridSearch";
 describe("useDataGridSearch", () => {
   it("debounces matching across columns and cells", async () => {
     vi.useFakeTimers();
-    const search = useDataGridSearch({ columns: ["id", "name"], rows: [[1, "Alice"]], getCellText: (row, column) => String(row[column] ?? "") });
+    // getCellSearchText 契约：返回小写文本（调用方负责缓存小写副本）
+    const search = useDataGridSearch({ columns: ["id", "name"], rows: [[1, "Alice"]], getCellSearchText: (row, column) => String(row[column] ?? "").toLowerCase() });
     search.searchText.value = "ali";
     await nextTick();
     expect(search.matches.value).toEqual([]);
     vi.advanceTimersByTime(150);
     await nextTick();
     expect(search.matches.value).toEqual([{ kind: "cell", displayRow: 0, col: 1 }]);
+    // matchSet 用数值 key：(displayRow+1)*65536+col
+    expect(search.matchSet.value.has((0 + 1) * 65536 + 1)).toBe(true);
+    vi.useRealTimers();
+  });
+
+  it("keys column-name matches with displayRow -1", async () => {
+    vi.useFakeTimers();
+    const search = useDataGridSearch({ columns: ["id", "name"], rows: [], getCellSearchText: () => "" });
+    search.searchText.value = "nam";
+    await nextTick();
+    vi.advanceTimersByTime(150);
+    await nextTick();
+    expect(search.matches.value).toEqual([{ kind: "column", displayRow: -1, col: 1 }]);
+    expect(search.matchSet.value.has((-1 + 1) * 65536 + 1)).toBe(true);
     vi.useRealTimers();
   });
 
   it("suggests columns and replaces only the active token", async () => {
     const columns = ref(["customer_id", "created_at"]);
-    const search = useDataGridSearch({ columns, rows: [], getCellText: () => "" });
+    const search = useDataGridSearch({ columns, rows: [], getCellSearchText: () => "" });
     search.searchText.value = "status = cus";
     await nextTick();
     expect(search.suggestions.value).toEqual(["customer_id"]);

apps/desktop/src/composables/useDataGridSearch.ts

@@ -1,4 +1,5 @@
 import { computed, getCurrentScope, nextTick, onScopeDispose, ref, toValue, watch, type MaybeRefOrGetter } from "vue";
+import { dataGridSearchMatchKey } from "@/lib/dataGrid/canvasDataGridRenderer";
 
 export type DataGridSearchMatch = {
   kind: "cell" | "column";
@@ -10,7 +11,9 @@ export type UseDataGridSearchOptions<Row> = {
   columns: MaybeRefOrGetter<readonly string[]>;
   suggestionColumns?: MaybeRefOrGetter<readonly string[]>;
   rows: MaybeRefOrGetter<readonly Row[]>;
-  getCellText: (row: Row, columnIndex: number) => string;
+  /** 必须返回小写文本（查询词已小写）。调用方可据此缓存小写副本，
+   * 避免每次按键对全部单元格重新分配 toLowerCase 字符串。 */
+  getCellSearchText: (row: Row, columnIndex: number) => string;
   debounceMs?: number;
   onNavigate?: (match: DataGridSearchMatch) => void;
 };
@@ -38,12 +41,13 @@ export function useDataGridSearch<Row>(options: UseDataGridSearchOptions<Row>) {
     });
     toValue(options.rows).forEach((row, displayRow) => {
       columns.forEach((_, col) => {
-        if (options.getCellText(row, col).toLowerCase().includes(query)) result.push({ kind: "cell", displayRow, col });
+        if (options.getCellSearchText(row, col).includes(query)) result.push({ kind: "cell", displayRow, col });
       });
     });
     return result;
   });
-  const matchSet = computed(() => new Set(matches.value.map((match) => `${match.kind}:${match.displayRow}:${match.col}`)));
+  // 数值 key（列头匹配 displayRow=-1），避免每匹配一次字符串拼接
+  const matchSet = computed(() => new Set(matches.value.map((match) => dataGridSearchMatchKey(match.displayRow, match.col))));
   const currentMatch = computed(() => matches.value[currentMatchIndex.value] ?? null);
 
   function clearTimer() {