fix(android-vulkan): bump osu-framework to 2026.502.3; prevent duplicate native crash dumps

[Copilot]

Two independent Vulkan black-screen causes on Adreno 740 (driver 512.676.73), plus a crash log hygiene fix.

vkCmdSetFragmentShadingRateKHR SIGSEGV (pc=0x0)

The driver advertises VK_KHR_fragment_shading_rate and returns a non-null proc addr for vkCmdSetFragmentShadingRateKHR, but the function jumps to 0x0 on call — crashing the Draw thread. The existing if (CmdSetFragmentShadingRate == null) guard is useless because the delegate wraps a broken native stub, not a missing one.

Fixed in veldrid PR #21 by chaining VkPhysicalDeviceFragmentShadingRateFeaturesKHR into vkCreateDevice — the driver then properly initialises the function pointer.

Consumed via osu-framework pack run #21 → 2026.502.3 (also includes the PR #20 chunked vkQueueSubmit fix for the Adreno 740 GPU stall / ANR).

Package bump

ppy.osu.Framework / .Android / .iOS: 2026.502.1 → 2026.502.3

Duplicate crash dumps (crash_handler.cpp)

g_inHandler is a transient re-entrancy guard — it's reset to 0 before raise(sig) so the chained handler (Mono) can run. If Mono re-raises SIGSEGV via tgkill and our handler has been re-installed between deliveries, it fires again and writes a second full dump.

Added a permanent g_dumpWritten latch (never cleared) so at most one dump is written per process lifetime. On subsequent invocations the handler still chains to g_prevHandlers for the system tombstone; falls back to SIG_DFL if sigaction fails.

// existing transient guard
volatile sig_atomic_t g_inHandler = 0;

// new: set once before first dump, never reset
volatile sig_atomic_t g_dumpWritten = 0;

if (g_dumpWritten) {
    bool restored = false;
    for (size_t i = 0; i < kNumSignals; ++i) {
        if (kSignals[i] == sig) {
            restored = (sigaction(sig, &g_prevHandlers[i], nullptr) == 0);
            break;
        }
    }
    if (!restored) signal(sig, SIG_DFL);
    g_inHandler = 0;
    raise(sig);
    return;
}
g_dumpWritten = 1;

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