Refactor: Update dependencies and Gradle configuration

This commit updates various dependencies and reconfigures Gradle settings to newer versions and standards.

Specific changes include:

-   Updated Android Gradle Plugin to 8.6.1
-   Updated Kotlin to 2.1.20
-   Updated Compose Compiler to 1.5.15
-   Updated Compose BOM to 2025.04.01
-   Updated Hilt to 2.54
-   Updated KSP to 2.1.20-2.0.0
-   Updated other dependencies like Navigation, Core-Ktx, Lifecycle, Activity Compose, Room, Paging, Coil, Serialization Json
-   Migrated to Java 21
-   Applied Compose plugin
- Updated target and compile SDK to 35
- updated jvm target to Java 21

.idea/gradle.xml

@@ -16,6 +16,7 @@
             </builds>
           </compositeBuild>
         </compositeConfiguration>
+        <option name="testRunner" value="CHOOSE_PER_TEST" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
         <option name="gradleJvm" value="#GRADLE_LOCAL_JAVA_HOME" />
         <option name="modules">
@@ -32,7 +33,6 @@
             <option value="$PROJECT_DIR$/feature/search" />
           </set>
         </option>
-        <option name="resolveExternalAnnotations" value="false" />
       </GradleProjectSettings>
     </option>
   </component>