Fix dialog loaded lifecycle race

[e271828-]

Summary

• gate HCaptchaDialogFragment.onStart() loaded replay so it only runs after the WebView has previously reported a real bridge load
• preserve the existing reuse-after-reset behavior for already-loaded WebViews
• prevent first dialog start from synthesizing onLoaded() before the JS SDK calls BridgeObject.onLoaded()

Why

This is an SDK lifecycle bug, not a live-test-only flake. onLoaded() has side effects: it emits the loaded listener callback, sets verify params, and auto-executes invisible challenges. Calling it unconditionally from onStart() can run those effects before web content has actually reported loaded, which matches the generic error 29 failure seen in live CI.

The original replay path appears useful for reusing a loaded WebView after reset, so this keeps that behavior but arms it only after a real bridge load.

Testing

• ./gradlew :sdk:check :test:compileDebugAndroidTestJavaWithJavac
• repo pre-commit check ran successfully during commit

[github-actions]

Diffuse report:

OLD: sdk-main.aar
NEW: sdk-pr.aar

 AAR      │ old       │ new       │ diff   
──────────┼───────────┼───────────┼────────
      jar │  94.7 KiB │  94.9 KiB │ +171 B 
 manifest │     411 B │     411 B │    0 B 
      res │  28.3 KiB │  28.3 KiB │    0 B 
    other │     1 KiB │     1 KiB │    0 B 
──────────┼───────────┼───────────┼────────
    total │ 124.4 KiB │ 124.6 KiB │ +171 B 

 JAR     │ old │ new │ diff       
─────────┼─────┼─────┼────────────
 classes │  61 │  61 │  0 (+0 -0) 
 methods │ 800 │ 800 │  0 (+0 -0) 
  fields │ 270 │ 272 │ +2 (+2 -0)

AAR

 size     │ diff   │ path          
──────────┼────────┼───────────────
 94.9 KiB │ +171 B │ ∆ classes.jar 
──────────┼────────┼───────────────
 94.9 KiB │ +171 B │ (total)

JAR

FIELDS:

   old │ new │ diff       
  ─────┼─────┼────────────
   270 │ 272 │ +2 (+2 -0) 
  
  + com.hcaptcha.sdk.HCaptchaDialogFragment replayLoadedOnStart: boolean
  + com.hcaptcha.sdk.HCaptchaDialogFragment webViewLoaded: boolean

[github-actions]

Benchmark report:

Test name	Time ms. (median)	Allocations (median)
com.hcaptcha.sdk.HCaptchaBenchmarkTest.EMULATOR_UNLOCKED_benchmarkInvisibleVerification	+493.31	+26
com.hcaptcha.sdk.HCaptchaBenchmarkTest.EMULATOR_UNLOCKED_benchmarkInvisibleVerificationColdRun	+834.69	+550
com.hcaptcha.sdk.HCaptchaBenchmarkTest.EMULATOR_UNLOCKED_benchmarkInvisibleSetup	+9.94	+514.25
com.hcaptcha.sdk.HCaptchaDebugInfoTest.EMULATOR_UNLOCKED_benchmarkDebugInfo	+30.13	-5535
com.hcaptcha.sdk.HCaptchaDebugInfoTest.EMULATOR_UNLOCKED_benchmarkDebugSys	+49.77	+39