Array element offset display, fold arrow UX, type picker popup, and provider cleanup

- Show relative hex offset on array element separators ([N] +0x...)
- Dim fold arrows and add hover highlight for better visibility
- Extend fold/chevron click areas for easier interaction
- Add type picker popup for array element type and pointer target editing
- Remove process_provider.h in favor of plugin-based provider system
- Expand compose/format to handle struct-of-array type names and widths

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/providers/process_provider.h

@@ -1,109 +0,0 @@
-#pragma once
-#include "provider.h"
-
-#ifdef _WIN32
-#include <windows.h>
-#include <psapi.h>
-
-namespace rcx {
-
-class ProcessProvider : public Provider {
-    HANDLE   m_handle   = nullptr;
-    uint64_t m_base     = 0;
-    int      m_size     = 0;
-    QString  m_name;
-
-    struct ModuleInfo {
-        QString  name;
-        uint64_t base;
-        uint64_t size;
-    };
-    QVector<ModuleInfo> m_modules;
-
-public:
-    ProcessProvider(HANDLE proc, uint64_t base, int regionSize, const QString& name)
-        : m_handle(proc), m_base(base), m_size(regionSize), m_name(name)
-    {
-        cacheModules();
-    }
-
-    ~ProcessProvider() override {
-        if (m_handle) CloseHandle(m_handle);
-    }
-
-    ProcessProvider(const ProcessProvider&) = delete;
-    ProcessProvider& operator=(const ProcessProvider&) = delete;
-
-    int size() const override { return m_size; }
-    bool isReadable(uint64_t, int len) const override { return len >= 0; }
-
-    bool read(uint64_t addr, void* buf, int len) const override {
-        if (!m_handle || len <= 0) return false;
-        SIZE_T got = 0;
-        ReadProcessMemory(m_handle,
-            (LPCVOID)(m_base + addr), buf, len, &got);
-        if ((int)got < len)
-            memset((char*)buf + got, 0, len - got);
-        return got > 0;
-    }
-
-    bool isWritable() const override { return true; }
-
-    bool write(uint64_t addr, const void* buf, int len) override {
-        SIZE_T got = 0;
-        BOOL ok = WriteProcessMemory(m_handle,
-            (LPVOID)(m_base + addr), buf, len, &got);
-        return ok && (int)got == len;
-    }
-
-    QString name() const override { return m_name; }
-    QString kind() const override { return QStringLiteral("Process"); }
-    bool isLive() const override { return true; }
-
-    // getSymbol takes an absolute virtual address and resolves it to
-    // "module.dll+0xOFFSET" using the cached module list.
-    QString getSymbol(uint64_t absAddr) const override {
-        for (const auto& mod : m_modules) {
-            if (absAddr >= mod.base && absAddr < mod.base + mod.size) {
-                uint64_t offset = absAddr - mod.base;
-                return QStringLiteral("%1+0x%2")
-                    .arg(mod.name)
-                    .arg(offset, 0, 16, QChar('0'));
-            }
-        }
-        return {};
-    }
-
-    HANDLE handle() const { return m_handle; }
-    uint64_t baseAddress() const { return m_base; }
-    uint64_t base() const override { return m_base; }
-    void setBase(uint64_t b) override { m_base = b; }
-    void refreshModules() { m_modules.clear(); cacheModules(); }
-
-private:
-    void cacheModules() {
-        HMODULE mods[1024];
-        DWORD needed = 0;
-        if (!EnumProcessModulesEx(m_handle, mods, sizeof(mods),
-                                   &needed, LIST_MODULES_ALL))
-            return;
-        int count = qMin((int)(needed / sizeof(HMODULE)), 1024);
-        m_modules.reserve(count);
-        for (int i = 0; i < count; ++i) {
-            MODULEINFO mi{};
-            WCHAR modName[MAX_PATH];
-            if (GetModuleInformation(m_handle, mods[i], &mi, sizeof(mi))
-                && GetModuleBaseNameW(m_handle, mods[i], modName, MAX_PATH))
-            {
-                m_modules.append({
-                    QString::fromWCharArray(modName),
-                    (uint64_t)mi.lpBaseOfDll,
-                    (uint64_t)mi.SizeOfImage
-                });
-            }
-        }
-    }
-};
-
-} // namespace rcx
-#endif // _WIN32

src/providers/provider.h

@@ -40,7 +40,7 @@ public:
 
     // Resolve an absolute address to a symbol name.
     // Returns empty string if no symbol is known.
-    // ProcessProvider: "ntdll.dll+0x1A30"
+    // Example: "ntdll.dll+0x1A30"
     // BufferProvider: "" (no symbols in flat files)
     virtual QString getSymbol(uint64_t addr) const {
         Q_UNUSED(addr);