Show active thread first in stack trace view

[Copilot]

When debugging programs with many threads, users had to scroll through the stack trace view to find the active thread, which was displayed in arbitrary order along with other threads. This made debugging multi-threaded applications inefficient and frustrating.

This PR modifies the thread display order in the stack trace view so that the active thread always appears at the top of the list, providing immediate access to the most relevant debugging information.

Changes Made

• Modified ThreadFrameModel::updateRows() in ui/threadframes.cpp to sort threads before displaying them
• Added sorting logic that prioritizes the active thread while maintaining consistent ordering for remaining threads
• Added #include <algorithm> header to support the sorting functionality

Implementation Details

The sorting uses a custom comparator that:

1. Places the active thread (identified by controller->GetActiveThread().m_tid) first
2. Sorts remaining threads by thread ID for predictable, consistent ordering
3. Preserves all existing functionality and UI behavior

std::sort(threads.begin(), threads.end(), [activeThreadId](const DebugThread& a, const DebugThread& b) {
    bool aIsActive = (a.m_tid == activeThreadId);
    bool bIsActive = (b.m_tid == activeThreadId);
    
    if (aIsActive && !bIsActive) return true;
    if (!aIsActive && bIsActive) return false;
    
    return a.m_tid < b.m_tid;
});

Benefits

• Improved debugging workflow: No more scrolling to find the active thread
• Better user experience: Most relevant information is immediately visible
• Consistent behavior: Predictable thread ordering makes the interface more intuitive
• Minimal impact: Only 15 lines of code added, no breaking changes

Fixes #726.

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