docs: fix markdown formatting across all wiki pages
- FAQ & Troubleshooting: add missing table header separators and final newline
- Features & Settings: fix table headers, add blank lines after section headings
- Home: fix table formatting, add blank lines in lists and sections
- Interactive Editor: fix table headers, add blank lines, label fenced code blocks
- Multilevel Mazes: fix table formatting, add blank lines, label code blocks
- Polar Circular Grids: fix table separators, label code blocks, add final newline
- Prop & Decor Spawner: fix table formatting, label code blocks, add final newline
- Shape Boundaries & Image Masking: fix tables, add blank lines, fix code indent
- Usage & Management: fix table headers, add blank lines, add final newline
- Vertex Painting & Post-Processing: fix tables, add blank lines, label code blocks
docs: update FAQ, features, and version info for v3.3.0
- FAQ: revise interactive editor exit instructions and stair/entrance placement docs to reflect sidebar tool-based interaction
- Features & Settings: document new `smooth_boundary_offset` property (0.0–2.0)
- Home: bump version from 3.2.0 → 3.3.0
- Polar Circular Grids: expand `polar_rings` range from 3–15 to 2–100
Created FAQ & Troubleshooting (markdown)