feat(elements): add BidiFindElementsMixin and BiDiWebElement

Implement BiDi element finding using browsingContext.locateNodes with
typed Locator variants (CssLocator, XPathLocator). BiDiWebElement uses
sharedId for element references and script.callFunction for all
interactions (click, text, visibility, etc). BiDiTab now inherits
BidiFindElementsMixin for find()/query() support.

Author: thalissonvs

pydoll/browser/firefox/tab.py

@@ -12,6 +12,7 @@
 from pydoll.commands.bidi.session_commands import SessionCommands
 from pydoll.commands.bidi.storage_commands import StorageCommands
 from pydoll.connection.bidi_connection_handler import BiDiConnectionHandler
+from pydoll.elements.mixins.bidi_find_elements_mixin import BidiFindElementsMixin
 from pydoll.protocol.bidi.base import Command, T_CommandParams, T_CommandResult
 from pydoll.protocol.events import BIDI_EVENT_MAP, Event
 from pydoll.protocol.types import Cookie, CookieParam
@@ -22,7 +23,7 @@
 logger = logging.getLogger(__name__)
 
 
-class BiDiTab:
+class BiDiTab(BidiFindElementsMixin):
     """Firefox tab automation via WebDriver BiDi protocol.
 
     Unlike CDP where each tab has its own WebSocket connection,