feat: add getPagePlatform() and update test-coverage

[Umutayb]

Summary

• Add getPagePlatform() public method that returns the platform string for a given page (defaults to 'web')
• Add unit tests for getPagePlatform() covering default, explicit, custom platforms, and error case
• Update @civitas-cerebrum/test-coverage from 0.0.8 to 0.0.9

Test plan

• All 210 tests passing
• New tests cover: default web platform, explicit platforms (web/android/ios), custom platforms (macos/windows), and missing page error

[github-actions]

📊 API Coverage Report

Build Passed: 100% API Coverage!

🔍 View Detailed Coverage Breakdown

ElementRepository: 12/12
[x] getPagePlatform
[x] setDefaultTimeout
[x] get
[x] getAll
[x] getRandom
[x] getByText
[x] getByAttribute
[x] getByIndex
[x] getVisible
[x] getByRole
[x] getSelectorRaw
[x] getSelector

PlatformElement: 24/24
[x] click
[x] fill
[x] clear
[x] check
[x] uncheck
[x] hover
[x] doubleClick
[x] scrollIntoView
[x] pressSequentially
[x] setInputFiles
[x] dispatchEvent
[x] isVisible
[x] isEnabled
[x] isChecked
[x] textContent
[x] getAttribute
[x] inputValue
[x] locateChild
[x] count
[x] all
[x] first
[x] nth
[x] filter
[x] waitFor

WebElement: 24/24
[x] click
[x] fill
[x] clear
[x] check
[x] uncheck
[x] hover
[x] doubleClick
[x] scrollIntoView
[x] pressSequentially
[x] setInputFiles
[x] dispatchEvent
[x] isVisible
[x] isEnabled
[x] isChecked
[x] textContent
[x] getAttribute
[x] inputValue
[x] locateChild
[x] count
[x] all
[x] first
[x] nth
[x] filter
[x] waitFor

_{Plain report generated by @civitas-cerebrum/test-coverage · 2026-03-27}