Merge remote-tracking branch 'origin/master' into claude/issue-57

# Conflicts:
#	project.cpp

implementations/Crafter.Graphics-Font.cpp

@@ -87,6 +87,28 @@ std::uint32_t Font::GetLineWidth(const std::string_view text, float size) {
     return lineWidth;
 }
 
+std::size_t Font::NearestCursorByte(std::string_view text, float size, float target) {
+    if (target <= 0.0f) return 0;
+    float scale = stbtt_ScaleForPixelHeight(&font, size);
+    std::size_t best     = 0;        // byte offset 0 → caret before the first glyph
+    float       bestDist = target;   // |target - 0|, and target > 0 here
+    float       cumWidth = 0.0f;
+    std::size_t i = 0;
+    while (i < text.size()) {
+        std::uint32_t cp = DecodeUtf8(text, i);   // i advances to the next boundary
+        if (cp == 0) break;
+        cumWidth += (int)(AdvanceUnits(cp) * scale);  // match GetLineWidth's per-glyph rounding
+        float d = std::abs(target - cumWidth);
+        if (d < bestDist) {
+            bestDist = d;
+            best     = i;            // byte offset just past this codepoint
+        } else {
+            break;                   // monotonic advance ⇒ already past the closest boundary
+        }
+    }
+    return best;
+}
+
 float Font::LineHeight(float size) {
     float scale = stbtt_ScaleForPixelHeight(&font, size);
     return (ascent - descent + lineGap) * scale;