feat: introduce platform-specific browser action and page state implementations #532

- Added Android stub implementations for `BrowserActionExecutor` and `PageStateExtractor`.
- Defined `BrowserActionExecutor` and `PageStateExtractor` as `expect`/`actual` interfaces for multiplatform support.
- Implemented a self-healing locator for element selector recovery with algorithmic and LLM-based approaches.
- Introduced comprehensive models for test actions, results, and page states with serialization support.

Author: phodal

mpp-core/src/androidMain/kotlin/cc/unitmesh/agent/e2etest/executor/BrowserActionExecutor.android.kt

@@ -0,0 +1,69 @@
+package cc.unitmesh.agent.e2etest.executor
+
+import cc.unitmesh.agent.e2etest.model.*
+
+/**
+ * Android implementation of BrowserActionExecutor.
+ * 
+ * @see <a href="https://github.com/phodal/auto-dev/issues/532">Issue #532</a>
+ */
+actual interface BrowserActionExecutor {
+    actual val isAvailable: Boolean
+    actual suspend fun execute(action: TestAction, context: ActionExecutionContext): ActionResult
+    actual suspend fun navigateTo(url: String): ActionResult
+    actual suspend fun click(tagId: Int, options: ClickOptions): ActionResult
+    actual suspend fun type(tagId: Int, text: String, options: TypeOptions): ActionResult
+    actual suspend fun scroll(direction: ScrollDirection, amount: Int, tagId: Int?): ActionResult
+    actual suspend fun waitFor(condition: WaitCondition): ActionResult
+    actual suspend fun pressKey(key: String, modifiers: List<KeyModifier>): ActionResult
+    actual suspend fun screenshot(name: String, fullPage: Boolean): ScreenshotResult
+    actual fun close()
+}
+
+/**
+ * Android stub implementation
+ */
+class AndroidBrowserActionExecutor(
+    private val config: BrowserExecutorConfig
+) : BrowserActionExecutor {
+    
+    override val isAvailable: Boolean = false
+    
+    override suspend fun execute(action: TestAction, context: ActionExecutionContext): ActionResult {
+        return ActionResult.failure("Not implemented on Android", 0)
+    }
+    
+    override suspend fun navigateTo(url: String): ActionResult {
+        return ActionResult.failure("Not implemented", 0)
+    }
+    
+    override suspend fun click(tagId: Int, options: ClickOptions): ActionResult {
+        return ActionResult.failure("Not implemented", 0)
+    }
+    
+    override suspend fun type(tagId: Int, text: String, options: TypeOptions): ActionResult {
+        return ActionResult.failure("Not implemented", 0)
+    }
+    
+    override suspend fun scroll(direction: ScrollDirection, amount: Int, tagId: Int?): ActionResult {
+        return ActionResult.failure("Not implemented", 0)
+    }
+    
+    override suspend fun waitFor(condition: WaitCondition): ActionResult {
+        return ActionResult.failure("Not implemented", 0)
+    }
+    
+    override suspend fun pressKey(key: String, modifiers: List<KeyModifier>): ActionResult {
+        return ActionResult.failure("Not implemented", 0)
+    }
+    
+    override suspend fun screenshot(name: String, fullPage: Boolean): ScreenshotResult {
+        return ScreenshotResult(success = false, error = "Not implemented")
+    }
+    
+    override fun close() {}
+}
+
+actual fun createBrowserActionExecutor(config: BrowserExecutorConfig): BrowserActionExecutor? {
+    return AndroidBrowserActionExecutor(config)
+}

mpp-core/src/androidMain/kotlin/cc/unitmesh/agent/e2etest/perception/PageStateExtractor.android.kt

@@ -0,0 +1,60 @@
+package cc.unitmesh.agent.e2etest.perception
+
+import cc.unitmesh.agent.e2etest.model.*
+
+/**
+ * Android implementation of PageStateExtractor.
+ * 
+ * Uses Android WebView for browser control.
+ * 
+ * @see <a href="https://github.com/phodal/auto-dev/issues/532">Issue #532</a>
+ */
+actual interface PageStateExtractor {
+    actual val isAvailable: Boolean
+    actual suspend fun extractPageState(): PageState
+    actual suspend fun extractAccessibilityTree(): AccessibilityNode?
+    actual suspend fun extractCleanDOM(): String
+    actual suspend fun captureScreenshotWithSoM(): SoMScreenshot?
+    actual suspend fun getActionableElements(): List<ActionableElement>
+    actual suspend fun getElementByTagId(tagId: Int): ActionableElement?
+    actual suspend fun getElementFingerprint(selector: String): ElementFingerprint?
+    actual suspend fun isPageLoaded(): Boolean
+    actual suspend fun getCurrentUrl(): String
+    actual suspend fun getPageTitle(): String
+    actual fun close()
+}
+
+/**
+ * Android stub implementation - WebView integration pending
+ */
+class AndroidPageStateExtractor(
+    private val config: PageStateExtractorConfig
+) : PageStateExtractor {
+    
+    override val isAvailable: Boolean = false
+    
+    override suspend fun extractPageState(): PageState {
+        return PageState(
+            url = "",
+            title = "",
+            viewport = Viewport(config.viewportWidth, config.viewportHeight),
+            actionableElements = emptyList(),
+            capturedAt = System.currentTimeMillis()
+        )
+    }
+    
+    override suspend fun extractAccessibilityTree(): AccessibilityNode? = null
+    override suspend fun extractCleanDOM(): String = ""
+    override suspend fun captureScreenshotWithSoM(): SoMScreenshot? = null
+    override suspend fun getActionableElements(): List<ActionableElement> = emptyList()
+    override suspend fun getElementByTagId(tagId: Int): ActionableElement? = null
+    override suspend fun getElementFingerprint(selector: String): ElementFingerprint? = null
+    override suspend fun isPageLoaded(): Boolean = false
+    override suspend fun getCurrentUrl(): String = ""
+    override suspend fun getPageTitle(): String = ""
+    override fun close() {}
+}
+
+actual fun createPageStateExtractor(config: PageStateExtractorConfig): PageStateExtractor? {
+    return AndroidPageStateExtractor(config)
+}