fix: rename cached media files to include extension when missing (#22753)

Path resolution can drop the file extension when the source filename
contains spaces (e.g. a Samsung screenshot named "screenshot_one ui
home123.jpg" resolves to a cached path ending in "screenshot_one ui
home123."). The existing code already derives the extension from the
MIME type and appends it to the filename, but the on-disk file path was
left unchanged. This caused downstream upload logic (wordpress-rs /
reqwest) to fail MIME type detection from the path, resulting in "not
allowed to upload this file type" errors.

Rename the cached file on disk to include the correct extension so that
the file path stored in the MediaModel is consistent with the filename.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: dcalhoun

WordPress/src/main/java/org/wordpress/android/util/FluxCUtils.java

@@ -144,6 +144,26 @@ public static MediaModel mediaModelFromLocalUri(@NonNull Context context,
             filename += "." + fileExtension;
         }
 
+        // Path resolution can drop the file extension when the filename contains
+        // spaces (e.g. "screenshot_one ui home123.jpg" resolves to a path ending
+        // in "screenshot_one ui home123."). Rename the on-disk file so the path
+        // includes the correct extension, allowing upload consumers to detect the
+        // MIME type from the filename.
+        if (fileExtension != null && !path.endsWith("." + fileExtension)) {
+            String correctedPath = path;
+            while (correctedPath.endsWith(".")) {
+                correctedPath = correctedPath.substring(0, correctedPath.length() - 1);
+            }
+            correctedPath = correctedPath + "." + fileExtension;
+            File renamed = new File(correctedPath);
+            if (file.renameTo(renamed)) {
+                path = correctedPath;
+            } else {
+                AppLog.w(T.UTILS,
+                    "Failed to rename cached file to include extension: " + path);
+            }
+        }
+
         MediaModel media = new MediaModel(
                 localSiteId,
                 DateTimeUtils.iso8601UTCFromTimestamp(System.currentTimeMillis() / 1000),