fix(ios): normalize ./ prefix when resolving relative SOURCEMAP_FILE

Strip leading ./ via parameter expansion before joining with the
project root, so ./maps/main.jsbundle.map resolves to a clean
absolute path instead of /project/root/./maps/main.jsbundle.map.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: antonis

packages/core/scripts/sentry-xcode.sh

@@ -20,7 +20,7 @@ RN_PROJECT_ROOT="${PROJECT_DIR}/.."
 # would resolve relative paths against `ios/` and fail to find the file.
 # See: https://github.com/getsentry/sentry-react-native/issues/3889
 if [[ "$SOURCEMAP_FILE" != /* ]]; then
-  export SOURCEMAP_FILE="$(cd "$RN_PROJECT_ROOT" && pwd)/$SOURCEMAP_FILE"
+  export SOURCEMAP_FILE="$(cd "$RN_PROJECT_ROOT" && pwd)/${SOURCEMAP_FILE#./}"
 fi
 
 if [ -z "$SENTRY_CLI_EXECUTABLE" ]; then

packages/core/test/scripts/sentry-xcode-scripts.test.ts

@@ -509,10 +509,10 @@ describe('sentry-xcode.sh', () => {
         SOURCEMAP_FILE: './maps/main.jsbundle.map',
       });
 
-      // The script concatenates: "$(cd RN_PROJECT_ROOT && pwd)/./maps/main.jsbundle.map"
-      // The ./ is preserved but the path is absolute and valid for sentry-cli.
+      // The leading ./ is stripped via ${SOURCEMAP_FILE#./} before concatenation,
+      // so the result is a clean absolute path without any ./ component.
       const projectRoot = path.dirname(tempDir);
-      const expectedPath = `${projectRoot}/./maps/main.jsbundle.map`;
+      const expectedPath = path.join(projectRoot, 'maps/main.jsbundle.map');
 
       expect(result.exitCode).toBe(0);
       expect(result.stdout).toContain(`SOURCEMAP_FILE=${expectedPath}`);