[Repo Assist] test: validate localization key parity and format placeholders

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Summary

Adds LocalizationValidationTests to the OpenClaw.Tray.Tests project. These tests guard against regressions in translation PRs — especially timely given the active community translation effort driven by issue #61 and PR #69.

What's new

AllLocales_HaveExactlySameKeysAsEnUs
Walks every locale directory under src/OpenClaw.Tray.WinUI/Strings/ and asserts that its Resources.resw file has exactly the same resource keys as en-us. Fails with a clear message listing the first 10 missing or extra keys.

AllLocales_PreserveFormatPlaceholders
For every en-us value that contains {0}, {1}, etc., asserts that the translated value contains the same set of format placeholders. Prevents runtime FormatException from a translator accidentally dropping or duplicating a placeholder.

Both tests auto-discover all locale directories, so no maintenance is needed as new languages are added.

Test Status

Passed! - Failed: 0, Passed: 95, Skipped: 0, Total: 95

2 new tests, all 93 existing tests still pass.

Trade-offs

• Tests require file system access to the repo tree (same pattern as ReadmeValidationTests). They use OPENCLAW_REPO_ROOT env var or walk up from the binary directory to locate the repo root — identical to the existing approach.
• No new dependencies.

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Show patch preview (155 of 155 lines)

From 6449f3bec8f765a397eebb35ada9b1f081f07f14 Mon Sep 17 00:00:00 2001
From: "github-actions[bot]" <github-actions[bot]@users.noreply.github.com>
Date: Thu, 19 Mar 2026 01:00:52 +0000
Subject: [PATCH] test: validate localization key parity and format
 placeholders
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Add LocalizationValidationTests to catch regressions in translation PRs:

- AllLocales_HaveExactlySameKeysAsEnUs: asserts every locale under
  Strings/ has exactly the same resource key set as en-us — no missing
  or extra entries. Runs against all present locales (zh-cn, and any
  future ones like fr-fr from PR #69).

- AllLocales_PreserveFormatPlaceholders: asserts that {0}/{1}/...
  format placeholders in translated values match the en-us source,
  preventing runtime FormatException from mistranslated strings.

95 Tray tests pass (93 existing + 2 new).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 .../LocalizationValidationTests.cs            | 117 ++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 tests/OpenClaw.Tray.Tests/LocalizationValidationTests.cs

diff --git a/tests/OpenClaw.Tray.Tests/LocalizationValidationTests.cs b/tests/OpenClaw.Tray.Tests/LocalizationValidationTests.cs
new file mode 100644
index 0000000..e758388
--- /dev/null
+++ b/tests/OpenClaw.Tray.Tests/LocalizationValidationTests.cs
@@ -0,0 +1,117 @@
+using System.Text.RegularExpressions;
+using System.Xml.Linq;
+
+namespace OpenClaw.Tray.Tests;
+
+/// <summary>
+/// Validates that all localization resource files are consistent with en-us.
+/// Catches missing/extra keys and broken format placeholders early — before translation PRs land.
+/// </summary>
+public class LocalizationValidationTests
+{
+    private static string GetRepositoryRoot()
+    {
+        var envRepoRoot = Environment.GetEnvironmentVariable("OPENCLAW_REPO_ROOT");
+        if (!string.IsNullOrWhiteSpace(envRepoRoot) && Direct
... (truncated)