Changelog 2026-03-05 (Accessibility Nav Overflow Adaptive Focus Pass 30)

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Changed

• Removed always-on tabindex from the main nav container in template markup.
• Updated nav overflow script to detect real overflow and conditionally:
  • enable/disable nav container keyboard focus (tabIndex 0 / -1),
  • show/hide the screen-reader overflow hint,
  • add/remove aria-describedby linkage to the hint.
• Added resize-based re-evaluation so accessibility behavior stays accurate across responsive breakpoints.

Why

• Avoids unnecessary extra tab stops when navigation does not overflow.
• Preserves keyboard guidance and overflow controls exactly when they are needed.