Complete graphical renderer parity

[forntoh]

Summary

• port remaining graphical renderer drawItem text/value windowing behavior
• improve cursor placeholder, blinker, toggle, list/submenu indicator, row-height, and scrollbar handling
• update focused GraphicalDisplayRenderer tests, including review-fix coverage for short values

Review fixes

• avoid reserving one-third of the row for short/empty values when valueAreaWidth is unset
• align draw color capture test stub with its expanded capture buffer

Checks

• git diff --check
• clang-format --dry-run --Werror src/renderer/GraphicalDisplayRenderer.cpp src/renderer/GraphicalDisplayRenderer.h test/GraphicalDisplayRenderer.cpp
• pio run -e esp32

Notes

• pio test -e esp32 is still blocked locally by missing ArduinoUnitTests.h / Godmode.h in the current repo test harness
• intentionally skipped snapshot deletion of test/GraphicalDisplayRenderer.cpp because focused coverage is valuable
• only GraphicalDisplayRenderer files and test/GraphicalDisplayRenderer.cpp are included

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