fix: preserve default locator strategy in WebDriver type hints

[MattL1989]

The type-only find_element and find_elements declarations require by, although their inherited Selenium implementations default it to By.ID. This makes mypy reject valid calls such as driver.find_element(value='target') with a missing-argument error.

Add the inherited defaults and a consumer-level mypy regression covering omitted and explicit locator strategies while checking Appium WebElement return types. Runtime method dispatch is unchanged. This addresses a separate signature mismatch adjacent to #1147.

Validation on Windows with Python 3.12.14, Selenium 4.48.0 and mypy 2.3.1, using the repository's frozen development dependencies:

• The new regression fails before the fix with two missing-by errors and passes afterward.
• python -m pytest test/unit/: 187 passed (dependency deprecation and mocked-thread exception warnings emitted).
• python -m mypy appium: 320 source files pass.
• python -m ruff check . and python -m ruff format --check .: pass.

Prepared with AI assistance. No device-dependent functional tests were run; the correction affects static type declarations only.

Could you also confirm whether this correction qualifies for a contributor payment under the Appium compensation scheme, and the applicable tier and expected payment timing? I am evaluating a small paid contribution trial and would like to confirm those details before taking on further work.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: MattL1989 / name: MattL1989 (667ee88, 80f66db, 900741d)

[KazuCocoa]

I assume this import can be inside if TYPE_CHECKING:

if TYPE_CHECKING:
    from selenium.webdriver.common.by import By

[MattL1989]

Valid, and safe. I checked the head commit: By appears only at line 23 (the import) and lines 285/288 and both stubs sit inside the class-level if TYPE_CHECKING: block, so By.ID is never evaluated at runtime.

[KazuCocoa]

The amount would be adjusted, but basically the policy will work if it meed S and larger one. It will be in a couple of months usually.

[MattL1989]

Both points addressed in 26824aa — By import moved under if TYPE_CHECKING: and the test removed. Re-ran ruff, mypy and the unit suite locally (186 passed). Thanks also for clarifying the compensation tiering and timing.