Fix renderer timeout hide debounce

[forntoh]

Summary

• track whether the renderer timeout has already fired in the current timer cycle
• reset timeout state when the renderer begins or the timer restarts
• avoid repeated timeout hide/log calls after the display is already hidden

Checks

• git diff --check
• pio run -e esp32

Notes

• Stacked on feat/graphical-display after PR Refine graphical effective columns #416 merge
• Only src/renderer/MenuRenderer.cpp and src/renderer/MenuRenderer.h are included

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[forntoh]

Closing this tiny timeout-debounce slice because its main benefit is dev-log suppression, which is not valuable enough to carry as a standalone PR. The graphical-display rollout will continue with larger coherent bundles.