chore(flow): expand host-return whitelist and add a DEBUG host bundle probe

- Rebuild the return-to-host whitelist from the CN/US top charts plus Apple
  system apps; drop the canOpenURL pre-check (LSApplicationQueriesSchemes
  is capped at 50) and let open() report failure.
- Never record an OSG bundle id as the host to return to.
- DEBUG only: probe the host bundle id through the keyboard arbiter
  callback and surface the log on a Home test card. Release builds keep
  the previous behaviour (no host identification).

OSGKeyboardTests/HostAppURLRegistryTests.swift

@@ -11,18 +11,53 @@ final class HostAppURLRegistryTests: XCTestCase {
         XCTAssertEqual(entry?.displayNameKey, "hostApp.wechat")
     }
 
+    /// App Store bundle ids; the earlier `com.tencent.wework` / `tv.danmaku.bili` never matched.
+    func testCorrectedBundleIds() {
+        XCTAssertEqual(HostAppURLRegistry.lookup(bundleId: "com.tencent.ww")?.returnURLString, "wxwork://")
+        XCTAssertEqual(HostAppURLRegistry.lookup(bundleId: "tv.danmaku.bilianime")?.returnURLString, "bilibili://")
+    }
+
+    func testSystemAppLookup() {
+        XCTAssertEqual(HostAppURLRegistry.lookup(bundleId: "com.apple.mobilenotes")?.returnURLString, "mobilenotes://")
+        XCTAssertNil(HostAppURLRegistry.lookup(bundleId: "com.apple.mobilesafari"))
+    }
+
     func testUnknownBundleReturnsNil() {
-        XCTAssertNil(HostAppURLRegistry.lookup(bundleId: "com.apple.MobileSMS"))
+        XCTAssertNil(HostAppURLRegistry.lookup(bundleId: "com.example.unknown"))
         XCTAssertNil(HostAppURLRegistry.lookup(bundleId: nil))
         XCTAssertNil(HostAppURLRegistry.lookup(bundleId: ""))
     }
 
-    func testQuerySchemesIncludesWeChat() {
-        XCTAssertTrue(HostAppURLRegistry.querySchemes.contains("weixin"))
+    func testEveryEntryHasParseableReturnURL() {
+        for entry in HostAppURLRegistry.entries {
+            XCTAssertNotNil(entry.returnURL?.scheme, entry.bundleId)
+        }
+    }
+
+    func testOwnBundleIdsAreNeverReturnTargets() {
+        XCTAssertTrue(HostAppURLRegistry.isOwnBundleId("com.osgkeyboard"))
+        XCTAssertTrue(HostAppURLRegistry.isOwnBundleId("com.osgkeyboard.ios"))
+        XCTAssertTrue(HostAppURLRegistry.isOwnBundleId("com.osgkeyboard.ios.keyboard"))
+        XCTAssertFalse(HostAppURLRegistry.isOwnBundleId("com.osgkeyboardx.ios"))
+        XCTAssertFalse(HostAppURLRegistry.isOwnBundleId("com.tencent.xin"))
     }
 
     func testEntriesHaveUniqueBundleIds() {
         let ids = HostAppURLRegistry.entries.map(\.bundleId)
         XCTAssertEqual(Set(ids).count, ids.count)
     }
+
+    func testEveryEntryHasLocalizedDisplayName() throws {
+        let bundle = Bundle(identifier: "com.osgkeyboard.ios") ?? .main
+        for language in ["en", "zh-Hans"] {
+            let path = try XCTUnwrap(bundle.path(forResource: language, ofType: "lproj"), language)
+            let strings = try XCTUnwrap(
+                NSDictionary(contentsOfFile: "\(path)/Localizable.strings") as? [String: String],
+                language
+            )
+            for entry in HostAppURLRegistry.entries {
+                XCTAssertNotNil(strings[entry.displayNameKey], "\(language): \(entry.displayNameKey)")
+            }
+        }
+    }
 }