Claude review: drm/panic: Look up glyph shape with font helper

[Claude Code Review Bot <claude-review@example.com>]

Patch Review

Converts `draw_txt_rectangle()` in `drm_panic.c`:

```c
-			src = drm_draw_get_char_bitmap(font, msg[i].txt[j], font_pitch);
+			src = font_data_glyph_buf(font->data, font->width, font->height,
+						  (unsigned char)msg[i].txt[j]);
 			rec.x2 = rec.x1 + font->width;
-			drm_panic_blit(sb, &rec, src, font_pitch, 1, color);
+			if (src)
+				drm_panic_blit(sb, &rec, src, font_pitch, 1, color);
 			rec.x1 += font->width;
```

Same pattern as patch 2. `rec.x2` is set before the NULL check, but this is harmless — it gets overwritten on the next loop iteration regardless.

The bounds checking is especially valuable in panic context where safety is paramount and we must not compound a crash with a second fault from an out-of-bounds font read.

**No bugs. Looks good.**

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Generated by Claude Code Patch Reviewer