fix(native): use thread state flavor on macOS

[bitsandfoxes]

Prior, thread_get_state was using the unified MACHINE_THREAD_STATE. The state's header was corrupting every register for non-crashing threads, causing them to show up as unknown. With this change thread_get_state now requests the explicit 64-bit flavor (ARM_THREAD_STATE64/x86_THREAD_STATE64) matching the arm_thread_state64_t destination.

Before

➜  sentry-native git:(master) ./build/sentry_example crash
[sentry] DEBUG crash-safe logs flush
[sentry] DEBUG crash-safe logs flush complete
[sentry] DEBUG crash-safe metrics flush
[sentry] DEBUG crash-safe metrics flush complete

========== Daemon Log (f3f8b51b) ==========
[2026-05-29 15:32:48] INFO initializing curl transport
[2026-05-29 15:32:48] WARN daemon could not acquire run folder lock
[2026-05-29 15:32:48] WARN FP 0xffffffff outside captured stack [0x187e06128 - 0x187e86128]
=========================================

After

➜  sentry-native git:(fix/macos-thread-state-flavor) ./build/sentry_example crash
[sentry] DEBUG crash-safe logs flush
[sentry] DEBUG crash-safe logs flush complete
[sentry] DEBUG crash-safe metrics flush
[sentry] DEBUG crash-safe metrics flush complete

========== Daemon Log (f3f8b741) ==========
[2026-05-29 15:32:01] INFO initializing curl transport
[2026-05-29 15:32:01] WARN daemon could not acquire run folder lock
=========================================

[bitsandfoxes]

This might be related to #1766 @jpnurmi?

[jpnurmi]

This might be related to #1766 @jpnurmi?

Nice! With both PRs combined, both columns get populated 👏