feat(view): the moon in its phase over the "Follow the Sun" background (#661)

At dawn, dusk and night the environment shows the moon in the top-left
corner of the scene, behind the plan: computed in the card from the home
coordinates and the browser clock (short Meeus series + topocentric
parallax, within 1.4° / 1.8 pp of JPL Horizons), one designer image under
a continuous phase mask with the lit side always on the left (owner
2026-09-29), a feathered terminator, 3°/3 % thresholds and the 2 s fade of
the window rays. Everything but a small gate lives in the lazy
moon-runtime chunk, with its own 30 s ticker. General settings: "Sun"
becomes "Sun and Moon" with one switch, on for new installations
(DEFAULT_CONFIG), off for existing ones.

The initial View graph sat 728 B under its budget: the gate is paid for by
moving fifteen dialog-only strings of General settings into the lazy
settings dictionary (#459) and by one build fingerprint literal instead of
three, so the graph ends 4 B above dev. Golden: two new moon scenes, and
the two General settings help frames show «Sun and Moon»; the WSL artifact
test fixture now models scenes whose first capture awaits acceptance.

Issue: #661
User-Visible: yes
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018qZfe7YS4rqEMKoVeS3GKd

scripts/check-inputs.mjs

@@ -342,7 +342,7 @@ export const CHECKS = {
     entries: ['test/*.test.mjs', 'scripts/no-new-any.mjs', 'scripts/no-new-private-writes.mjs', 'scripts/render-layout-read.mjs', 'scripts/bundle-budget.mjs',
       'scripts/fix-test-build.mjs', 'scripts/unused-locals-gate.mjs'],
     // demo/helpers/** — область no-new-private-writes (#629): гейт читает их текст.
-    roots: [...BUILD_INPUTS, 'assets/furniture/**', 'test/**', 'tsconfig*.json', 'scripts/monolith-baseline.json', 'demo/smoke_*.mjs', 'demo/benchmark_*.mjs', 'demo/guard/*.mjs', 'demo/helpers/**', ...WORKFLOW],
+    roots: [...BUILD_INPUTS, 'assets/furniture/**', 'assets/moon/**', 'test/**', 'tsconfig*.json', 'scripts/monolith-baseline.json', 'demo/smoke_*.mjs', 'demo/benchmark_*.mjs', 'demo/guard/*.mjs', 'demo/helpers/**', ...WORKFLOW],
   },
   changed_mutants: {
     entries: ['scripts/mutation-*.mjs', 'scripts/*-guard.mjs', 'test/*.test.mjs', 'demo/smoke_*.mjs', 'tests_backend/**/*.py'],