[Gemini-cli] fix: Handle missing fields in Wikipedia API response

This commit fixes a crash that occurred when the Wikipedia API response was missing certain fields.

The main changes are:
- Made the `size`, `wordcount`, and `timestamp` fields in the `SearchResult` data class nullable to handle cases where they are not present in the API response.
- Updated the unit test for the network module to check for null values.

Author: menny

network/src/main/java/com/anysoftkeyboard/janus/network/SearchResponse.kt

@@ -34,8 +34,8 @@ data class SearchResult(
     @Json(name = "ns") val ns: Int,
     @Json(name = "title") val title: String,
     @Json(name = "pageid") val pageid: Long,
-    @Json(name = "size") val size: Int,
-    @Json(name = "wordcount") val wordcount: Int,
+    @Json(name = "size") val size: Int?,
+    @Json(name = "wordcount") val wordcount: Int?,
     @Json(name = "snippet") val snippet: String,
-    @Json(name = "timestamp") val timestamp: String
+    @Json(name = "timestamp") val timestamp: String?
 )

network/src/test/java/com/anysoftkeyboard/janus/network/WikipediaClientTest.kt

@@ -7,6 +7,7 @@ import okhttp3.mockwebserver.MockResponse
 import okhttp3.mockwebserver.MockWebServer
 import org.junit.After
 import org.junit.Assert.assertEquals
+import org.junit.Assert.assertNull
 import org.junit.Before
 import org.junit.Test
 import retrofit2.Retrofit
@@ -66,10 +67,7 @@ class WikipediaClientTest {
                     "ns": 0,
                     "title": "Monster Summer",
                     "pageid": 71763900,
-                    "size": 10071,
-                    "wordcount": 773,
-                    "snippet": "Monster <span class=\"searchmatch\">Summer</span> is a 2024 American adventure horror film directed by David Henrie, written by Cornelius Uliano and Bryan Schulz, and starring Mason Thames",
-                    "timestamp": "2025-08-09T19:56:14Z"
+                    "snippet": "Monster <span class=\"searchmatch\">Summer</span> is a 2024 American adventure horror film directed by David Henrie, written by Cornelius Uliano and Bryan Schulz, and starring Mason Thames"
                   }
                 ]
               }
@@ -93,5 +91,9 @@ class WikipediaClientTest {
     assertEquals(
         "<span class=\"searchmatch\">Summer</span> or summertime is the hottest and brightest of the four temperate seasons, occurring after spring and before autumn. At or centred on the summer",
         response.query.search[0].snippet)
+    assertEquals("Monster Summer", response.query.search[1].title)
+    assertNull(response.query.search[1].size)
+    assertNull(response.query.search[1].wordcount)
+    assertNull(response.query.search[1].timestamp)
   }
 }