Document graphical display renderer

[forntoh]

Summary

• expand GraphicalDisplayRenderer documentation with U8g2 display support, fonts, glyphs, layout, highlighting, indicators, scrollbar, and frame buffering
• convert existing character-display media examples to tabbed sections with future graphical-display placeholders
• preserve existing 16x2 I2C character display screenshots/GIFs and avoid broken image references for missing graphical assets

Checks

• make html from docs/ succeeded with existing unrelated warnings
• git diff --cached --check before commit

Notes

• graphical display placeholder tabs describe expected future filenames only; no missing image directives were added
• unrelated local files remain uncommitted/excluded: diagram.json, wokwi.toml, examples/Widgets/Widgets.ino, bin/, docs/source/reference/samples/, solo.yml

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