new feature: added reusable Flutter UI assertions (visible, tappable, text, etc.) #796
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This PR adds the first built-in assertion helpers to appium-flutter-driver, making Flutter UI tests more expressive and easier to write.
Included Assertions:
assertVisible
assertNotVisible
assertTappable
assertTextPresent
assertValueKeyVisible
assertTooltipPresent
These helpers support flexible input using key, text, or label, and wrap common wait commands like flutter:waitFor with clean error handling and timeouts.
🔍 Note: The ./finder import used in assertions.ts may need review — please confirm it's the best approach.