…pty (#359) ## Summary Fixes Issue #355 where the first plot appeared empty on GitHub Pages. The issue was caused by the backend not being initialized during the `figure()` call, which led to plot_count being reset when `ensure_global_figure_initialized()` was called later. ## Problem The bug occurred because: 1. `figure()` called `fig%initialize()` without backend parameter 2. Backend remained unallocated 3. Later calls (`plot`, `title`, etc.) checked if backend was allocated 4. Since it wasn't, they called `initialize()` again, resetting plot_count to 0 5. This caused the first plot data to be lost, resulting in only black dots being rendered ## Solution - Initialize default PNG backend in `figure_t%initialize()` if not specified - Add default color initialization to `plot_data_t` type (both versions) - Add test to verify first plot renders with correct colors ## Test Added `test_first_plot_rendering.f90` which verifies that the first plot renders with proper colors (not just dots). Fixes #355 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>

First plot is empty #355

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