feat: wire content scripts and styling

src/content/index.ts

@@ -0,0 +1,9 @@
+import { LeetCodeAdapter } from '../platforms/leetcode/adapter';
+
+console.log('[CommitCode] Content script loaded on', window.location.href);
+
+const adapter = new LeetCodeAdapter();
+adapter.startListening((problem) => {
+  console.log('[CommitCode] Sending problem to Sync Engine:', problem);
+  chrome.runtime.sendMessage({ type: 'SYNC_PROBLEM', problem });
+});

src/platforms/types.ts

@@ -0,0 +1,14 @@
+import { ProblemRecord } from '../storage/types';
+
+export interface PlatformAdapter {
+  /**
+   * Initializes any listeners or mutation observers needed to detect a submission.
+   * Calls the provided callback when an accepted submission is detected.
+   */
+  startListening(onSubmissionDetected: (problem: ProblemRecord) => void): void;
+
+  /**
+   * Cleans up any listeners.
+   */
+  stopListening(): void;
+}