Fix glitchy labels layer when zoom changes, make labels sublayer ids unique per tile

[xinaesthete]

multiscale labels bitmask sublayers could reuse the same deck layer id across different tile resolutions when their world bounds matched. During viewState changes, deck could transfer stale tile/texture state between those layers, leading to intermittent bad transformations.

Summary by CodeRabbit

• Bug Fixes
  • Improved label rendering precision by enhancing tile coordinate handling in layer identification, ensuring correct label display across different zoom levels and map positions.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 44d55723-c3f2-4620-86a9-96cf78c39820

📥 Commits

Reviewing files that changed from the base of the PR and between 84cb76d and f8b82f0.

📒 Files selected for processing (1)

• .changeset/steady-labels-transform.md

📝 Walkthrough

Walkthrough

The PR updates labels bitmask sub-layer ID generation to incorporate tile coordinates (z, x, y) alongside existing bounds and parent layer ID, ensuring unique identifiers across zoom levels and tile positions. A new test validates this behavior; three test suites are refactored to use a centralized ID constant instead of hardcoded duplicates.

Changes

Labels Bitmask Sub-Layer ID Enhancement

Layer / File(s)	Summary
ID generation and validation test packages/layers/src/LabelsLayer.ts, packages/layers/tests/labelsLayer.spec.ts	renderSubBitmaskLayers now embeds tile coordinates into the sub-layer id string. A new test case verifies that tiles at different zoom levels (differing tile.index.z) produce distinct sub-layer IDs.
Test constant refactoring packages/vis/tests/featureTooltipHover.spec.ts	A new LABELS_BITMASK_LAYER_ID constant consolidates the labels bitmask sub-layer ID value previously hardcoded in multiple test assertions, reducing duplication across three test cases that handle layer resolution, bitmask-to-logical normalization, and targeted picking with duplicate overlays.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

A rabbit hops through layer heights,
Each tile gets coords shining bright,
No duplicate ID strings roam,
Constants make the tests feel home. 🐇✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: making labels sublayer IDs unique per tile to fix glitches during zoom changes. It directly corresponds to the primary modifications across all three files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fix-label-layer-transform-glitch

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