fix: improve glob tool Windows compatibility and rg resolution (#309)

src/tools/grep/constants.ts

@@ -2,6 +2,7 @@ import { existsSync } from "node:fs"
 import { join, dirname } from "node:path"
 import { spawnSync } from "node:child_process"
 import { getInstalledRipgrepPath, downloadAndInstallRipgrep } from "./downloader"
+import { getDataDir } from "../../shared/data-path"
 
 export type GrepBackend = "rg" | "grep"
 
@@ -36,6 +37,9 @@ function getOpenCodeBundledRg(): string | null {
   const rgName = isWindows ? "rg.exe" : "rg"
 
   const candidates = [
+    // OpenCode XDG data path (highest priority - where OpenCode installs rg)
+    join(getDataDir(), "opencode", "bin", rgName),
+    // Legacy paths relative to execPath
     join(execDir, rgName),
     join(execDir, "bin", rgName),
     join(execDir, "..", "bin", rgName),