perf(console): cull off-screen wrapped rows

A long wrapped console line could extend far past the viewport, yet
every sub-row was still measured and drawn.

- Sub-rows that fall entirely outside the clip rect are now skipped. The
  per-row ordinal still advances for a culled row, so scanline parity is
  unchanged.

No visible change; only off-screen rows are skipped.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/ui/windows/console_tab.cpp

@@ -1064,6 +1064,8 @@ void ConsoleTab::drawVisibleLines(float padX, float lineHeight, bool hasTextFilt
 
     ImDrawList* dl = ImGui::GetWindowDrawList();
     ImU32 selColor = WithAlpha(Secondary(), 80);
+    const float clipMinY = dl->GetClipRectMin().y;
+    const float clipMaxY = dl->GetClipRectMax().y;
 
     // A fold triangle clicked this frame; applied after the loop so we don't mutate the model
     // mid-draw. -1 = none.
@@ -1165,6 +1167,15 @@ void ConsoleTab::drawVisibleLines(float padX, float lineHeight, bool hasTextFilt
             const char* segStart = line.text.c_str() + seg.byteStart;
             const char* segEnd   = line.text.c_str() + seg.byteEnd;
 
+            // Row-granularity cull: a long wrapped line may extend far past the viewport, so skip
+            // sub-rows entirely outside the clip rect. The ordinal still advances once per sub-row
+            // (culled or not) so scanline parity is unchanged.
+            const bool rowVisible = rowY + seg.height >= clipMinY && rowY <= clipMaxY;
+            if (!rowVisible) {
+                ++scanRowOrdinal;
+                continue;
+            }
+
             if (s_scanline_enabled && lineHeight > 0.0f) {
                 scanline_rows_.push_back({rowY, rowY + seg.height, scanRowOrdinal});
             }