Force open links in current page to stay in operator page context

Previously some link clicks would open in new tab. This is out of the
browser operator's context and so the new page cannot be interacted
with by the browser operator.

This change catches new page opens and opens them in the context page
instead.

src/khoj/processor/operator/browser_operator.py

@@ -124,9 +124,25 @@ async def start_browser(width: int = 1024, height: int = 768):
         launch_args = [f"--window-size={width},{height}", "--disable-extensions", "--disable-file-system"]
         browser = await playwright.chromium.launch(chromium_sandbox=True, headless=False, args=launch_args, env={})
 
+    # Get the initial browser, page or create one if none exist
     default_context = browser.contexts[0] if browser.contexts else await browser.new_context()
-
     page = default_context.pages[0] if default_context.pages else await default_context.new_page()
+
+    # Define a handler for new pages
+    async def handle_new_page(new_page: Page):
+        # Get the target URL of the new page
+        target_url = new_page.url
+        # Close the new page if it is not closed
+        if not new_page.is_closed():
+            await new_page.close()
+        # Open the target url in the current page instead
+        if target_url and target_url != "about:blank":
+            logger.debug(f"Load {target_url} in current page instead of new tab to stay in operator context.")
+            await page.goto(target_url)
+
+    # Listen for new pages being created in the context
+    default_context.on("page", handle_new_page)
+
     # If page url is blank, navigate to DuckDuckGo
     if page.url == "about:blank":
         await page.goto("https://duckduckgo.com")