Eliminate continuous-zoom tile flicker

[Occumed79]

Why this PR exists

PR #26 proved that ten static destinations eventually load, but its browser script used jumpTo(), waited for areTilesLoaded(), and captured only settled frames. Production still flickers while the camera is actively zooming or panning.

Changes

• keeps still-loading parent zoom tiles instead of canceling them during zoom;
• retains eight zoom levels in MapLibre's tile cache;
• prevents in-session tile expiration refreshes;
• restores normal label collision fading;
• limits the physical surface archive to the land mask so its landcover and depth geometry no longer overlaps the overview or regional archives;
• adds a true animated motion gate covering world-to-street zoom, street-to-world zoom, a US-Mexico pan, and a Europe cross-shard pan;
• samples rendered vector features while the map is moving and fails on any blank frame or source change;
• records p50, p95, and maximum tile response latency.

Merge rule

Keep this draft and do not merge until the continuous-motion workflow is green and its artifact shows zero blank samples. No production changes should be made from this branch before that evidence is inspected.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 249411f5-2869-48ea-af0a-f1ac4b1579b9

📥 Commits

Reviewing files that changed from the base of the PR and between 7497b9d and 61c42f0.

📒 Files selected for processing (8)

• .github/workflows/validate-continuous-zoom.yml
• scripts/check-globe-parity.mjs
• scripts/check-pmtiles-integration.mjs
• scripts/check-world-tile-gateway.mjs
• scripts/lock-reference-atmosphere.mjs
• scripts/validate-continuous-zoom.mjs
• src/occumed-map.js
• src/server/world-tile-gateway.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/continuous-zoom-no-flicker

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