fix: serialize non-finite accessibility ranges

[RasulOs]

Summary

• Serialize non-finite accessibility range values as JSON null.
• Preserve finite min, max, and current values and the range type.
• Add JVM regressions for -Infinity, +Infinity, NaN, and finite ranges.
• Add an Android instrumentation regression using a real framework-sealed accessibility node with unbounded range bounds.

Root cause

Android permits accessibility ranges with infinite bounds. Portal copied those values directly into its accessibility-tree JSON, but JSON encoding rejects non-finite numbers with Forbidden numeric value: -Infinity. As a result, state_full/get_state failed and the client repeatedly retried an unrecoverable serialization error.

User impact

Accessibility trees containing unbounded ranges now return valid JSON. Consumers receive null for non-finite range fields instead of losing the entire device state response.

Validation

• Focused AccessibilityTreeBuilderTest: 7/7 passed
• Debug Portal APK and Android test APK built successfully
• Android 16/API 36 instrumentation regression: passed
• Live state_full validation: successful valid JSON with no forbidden numeric-value error
• Full JVM suite: 482/483 passed. The remaining failure is the unrelated pre-existing SwitchTintResourceTest.trackTintSeparatesCheckedAndUncheckedStates color mismatch (#0D9373 expected, #4566D9 actual); the relevant resources and test are unchanged from origin/main

References droidrun/mobilerun#386.

[github-actions]

🧪 Test Build Ready

APK for PR #150 is available for testing.

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[RasulOs]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Bravo.

Reviewed commit: 817c7e73fd

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