feat: disasm popup, symbol separation, context menu improvements, RVA fixes

- Add Fadec x86 disassembler with hover popup for FuncPtr/void Pointer nodes
- Separate pointer symbol from address: // prefix, green comment coloring,
  independent hover/click zones (address triggers popup, symbol is passive)
- Fix RVA margin and inline local offset for pointer-expanded vtable children
  using ptrBase field threaded through composition
- Expand multi-select context menu with quick-convert, duplicate, copy address
- Remove Edit Value from hex node context menu
- Fix heatmap flickering on hex nodes (remove per-byte alternation)
- Fix popup repositioning when moving mouse between lines
- Truncate disasm popup to 6 lines with ... indicator
- Add BUILD_UI_TESTS option to skip widget tests on headless CI
- Add test_disasm with 35 test cases for disassembly and hex dump
- Add KUSER_SHARED_DATA example .rcx file

third_party/fadec/encode2-test.cc

@@ -0,0 +1,64 @@
+
+#include <array>
+#include <cstring>
+#include <cstdio>
+#include <cstdlib>
+
+#include <fadec-enc2.h>
+
+
+using Buffer = std::array<uint8_t, 16>;
+
+static
+void print_hex(const uint8_t* buf, size_t len) {
+    for (size_t i = 0; i < len; i++)
+        std::printf("%02x", buf[i]);
+}
+
+static int
+check(const Buffer& buf, const char* exp, size_t exp_len, unsigned res, const char* name) {
+    if (res == exp_len && !std::memcmp(buf.data(), exp, exp_len))
+        return 0;
+    std::printf("Failed case (new) %s:\n", name);
+    std::printf("  Exp (%2zu): ", exp_len);
+    print_hex(reinterpret_cast<const uint8_t*>(exp), exp_len);
+    std::printf("\n  Got (%2u): ", res);
+    print_hex(buf.data(), res);
+    std::printf("\n");
+    return -1;
+}
+
+#define TEST1(str, exp, name, ...) do { \
+            buf.fill(0); \
+            unsigned res = fe64_ ## name(buf.data(), __VA_ARGS__); \
+            failed |= check(buf, exp, sizeof(exp) - 1, res, str); \
+        } while (0)
+#define TEST(exp, ...) TEST1(#__VA_ARGS__, exp, __VA_ARGS__)
+
+#define TEST_CPP1(str, exp, expr) do { \
+            buf.fill(0); \
+            unsigned res = (expr); \
+            failed |= check(buf, exp, sizeof(exp) - 1, res, str); \
+        } while (0)
+#define TEST_CPP(exp, ...) TEST_CPP1(#__VA_ARGS__, exp, __VA_ARGS__)
+
+int main() {
+    int failed = 0;
+    Buffer buf{};
+
+    // This API is type safe and prohibits compilation of reg-type mismatches
+#define ENC_TEST_TYPESAFE
+    // Silence -Warray-bounds with double cast
+#define FE_PTR(off) (const void*) ((uintptr_t) buf.data() + (off))
+#define FLAGMASK(flags, mask) flags, mask
+#include "encode-test.inc"
+
+    // Test implicit conversion of parameters also on the actual functions
+    TEST_CPP("\x0f\x90\xc0", fe64_SETO8r(buf.data(), 0, FE_AX));
+    TEST_CPP("\x0f\x90\xc0", (fe64_SETO8r)(buf.data(), 0, FE_AX));
+    TEST_CPP("\x0f\x90\xc4", fe64_SETO8r(buf.data(), 0, FE_AH));
+    TEST_CPP("\x0f\x90\xc4", (fe64_SETO8r)(buf.data(), 0, FE_AH));
+
+    std::puts(failed ? "Some tests FAILED" : "All tests PASSED");
+    return failed ? EXIT_FAILURE : EXIT_SUCCESS;
+}