Fix baseWidth fallback cascade in export width measurement

[Copilot]

Addresses feedback on #16 regarding flawed fallback logic that prevented rect.width from being evaluated when intrinsic width measurements failed.

Problem

The existing fallback logic applied the minimum value too early, making the conditional check unreachable:

baseWidth = Math.max(el.scrollWidth || 0, el.offsetWidth || 0, 1);
if (!baseWidth || !Number.isFinite(baseWidth)) baseWidth = Math.max(rect.width || 0, 1);

Since Math.max(..., 1) guarantees baseWidth >= 1, the condition !baseWidth is never true, and rect.width is never checked.

Solution

Restructured to cascade through measurements before applying the minimum:

// Try intrinsic measurements first
baseWidth = Math.max(el.scrollWidth || 0, el.offsetWidth || 0);
// Fall back to bounding rect if intrinsic measurements fail
if (!baseWidth || !Number.isFinite(baseWidth)) {
  baseWidth = rect.width || 0;
}
// Apply minimum only after all measurements attempted
baseWidth = Math.max(baseWidth, 1);

This ensures all available width sources are evaluated before defaulting to the hardcoded minimum.

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