Improve viewer variable names

Rename short local variables and parameters in the viewer loading, sidecar, and BonsaiViewer command paths to make their responsibilities clearer.\n\nGenerated with the assistance of an AI coding tool.

src/ifcviewer/StreamingLoader.cpp

@@ -52,25 +52,25 @@ struct SidecarHeaderRaw {
 // walks the metadata tail through one of these so a truncated buffer fails
 // cleanly (return false) instead of reading out of bounds.
 struct BufCursor {
-    const uint8_t* p;
-    size_t remaining;
+    const uint8_t* cursor;
+    size_t remaining_bytes;
 
     bool take(void* dst, size_t bytes) {
-        if (bytes > remaining) return false;
-        std::memcpy(dst, p, bytes);
-        p += bytes;
-        remaining -= bytes;
+        if (bytes > remaining_bytes) return false;
+        std::memcpy(dst, cursor, bytes);
+        cursor += bytes;
+        remaining_bytes -= bytes;
         return true;
     }
 
     // Read a uint32 length prefix followed by length*sizeof(T) elements.
     template<typename T>
-    bool takeVec(std::vector<T>& v) {
+    bool takeVec(std::vector<T>& values) {
         uint32_t n;
         if (!take(&n, 4)) return false;
-        if (uint64_t(n) * sizeof(T) > remaining) return false;
-        v.resize(n);
-        if (n > 0 && !take(v.data(), size_t(n) * sizeof(T))) return false;
+        if (uint64_t(n) * sizeof(T) > remaining_bytes) return false;
+        values.resize(n);
+        if (n > 0 && !take(values.data(), size_t(n) * sizeof(T))) return false;
         return true;
     }
 };
@@ -119,7 +119,7 @@ bool parseSidecarDeferred(const uint8_t* data, size_t n, SidecarData& out) {
     if (!c.takeVec(out.elements)) return false;
     uint32_t stbl_len = 0;
     if (!c.take(&stbl_len, 4))       return false;
-    if (stbl_len > c.remaining)      return false;
+    if (stbl_len > c.remaining_bytes) return false;
     out.string_table.resize(stbl_len);
     if (stbl_len > 0 && !c.take(out.string_table.data(), stbl_len)) return false;
     return true;