The theme toggle and the account-menu avatar are drawn 40px and had no target
extension; both now carry `touch-target`, and the avatar's clipping moves from
the button (which would have cut the pseudo-target off) to the <img>. The rail's
hand-rolled `after:` target becomes the same utility.
Plan: docs/plans/material-3-alignment.md, step 14 (navigation N-01).
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
M3 Expressive's flexible navigation bar, the collapsed, expanded and
modal navigation rail with its state applied before the first paint,
and an adaptive app shell composing them. The head script now restores
the theme and rail attributes that wire:navigate strips from <html>.
Completes Phase 8.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V9NnLxnPp8vaaurb3Z1MFy
