New Crowdin translations - zh-CN (#25965)

Co-authored-by: Crowdin Bot <support+bot@crowdin.com>

docs/zh/gps_compass/ark_sam_gps.md

@@ -56,6 +56,6 @@ The module should be plug-n-play when used with the `GPS2` port on most flight c
 | 5          | SDA         | 3.3V |
 | 6          | GND         | GND                  |
 
-## See Also
+## 另见
 
 - [ARK SAM GPS Documentation](https://arkelectron.gitbook.io/ark-documentation/gps/ark-sam-gps) (ARK Docs)

docs/zh/gps_compass/index.md

@@ -197,6 +197,14 @@ It is possible to have low DOP (good satellite geometry) but still have high EPH
 
 EPH/EPV values therefore provide a more immediate and practical estimate of the actual GPS accuracy you can expect under current conditions.
 
+### GNSS Position Fusion
+
+GNSS position fusion will not begin until yaw alignment is established.
+If a magnetometer is available, the EKF aligns yaw using the magnetic heading, allowing GPS position fusion to start soon after boot.
+If no magnetometer is present, the system must rely on GPS yaw (from a dual-antenna setup) or movement-based yaw estimation.
+Until one of these provides a valid heading, the EKF will not start GPS position fusion, and the vehicle will remain in a “no position” state even though attitude data is valid.
+This behavior prevents large position errors that could occur when the yaw reference is uncertain.
+
 ## 开发人员信息
 
 - GPS/RTK-GPS