Fix mode-line face realization

[eval-exec]

What changed

• use the canonical BasicFaceId::name() mapping for active and inactive window chrome
• realize buffer-sensitive basic faces over the frame default, while preserving direct and inherited face remaps
• encode that distinction as WindowNamedOverFrameDefault
• add renderer-level regressions for active-face decorations and Treemacs-style buffer-local text scaling

Why

Selected mode lines were sometimes realized as the mode-line parent instead of mode-line-active, which leaked parent decorations and metrics. Separately, a buffer-local default scale—such as treemacs-text-scale—was incorrectly used as the base for inactive mode-line realization, shrinking window chrome along with buffer text.

GNU Emacs realizes each typed basic face from its canonical name and starts window-named realization from the frame's unremapped default. This change follows that boundary while retaining legitimate named face remappings.

Impact

• active mode lines honor mode-line-active attributes, including explicit decoration suppression
• Treemacs and similarly scaled buffers keep normal-sized mode-line text
• body text remains buffer-locally scaled

Validation

• test-first renderer-level regressions
• GNU Emacs 31 private-X11 oracle: main and Treemacs-like mode lines both 23 px
• rebuilt Neomacs private-X11 verification: both mode lines 23 px
• cargo nextest run -p neomacs-display-protocol -p neomacs-layout-engine: 2,605 passed, 3 skipped
• cargo fmt --all -- --check
• git diff --check

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