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feat(examples): add useDevicePixels toggle to basemap-browser (#10332)

* chore(core) Adopt luma CanvasContext

* fix

* chore(core): route canvas sizing through CanvasContext

* fix(google-maps): update overlay style container

* fix(core): sync attached gl drawing buffer on resize

* prettier

* docs: add agent merge guidance

* fix(react): preserve element props typing

* docs: expand merge readiness guidance

* fix

* test(core): isolate canvas context resize devices

* Revert "test(core): isolate canvas context resize devices"

This reverts commit b13922f90.

* test(core): avoid shared canvas context mutation

* test(core): avoid shared picker canvas context mutation

* fix(core): only forward explicit device pixel ratio

* fix(core): avoid replaying default props into canvas context

* fix(core): repopulate invalid picking color cache

* Address comments

* feat(examples): add useDevicePixels toggle to basemap-browser

Adds a checkbox to test useDevicePixels override (toggles between true
and 1.5) across all renderer configurations. This helps verify that
custom DPR settings are correctly forwarded in attached-gl/interleaved
mode paths.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat(examples): use basemap pixelRatio for interleaved mode + add CDN test pages

Pass pixelRatio to MapLibre/Mapbox Map constructor when useDevicePixels
is set to a custom value, since the basemap owns the canvas in
interleaved mode. Also adds standalone HTML test pages for validating
useDevicePixels across deck.gl 9.1, 9.2, 9.3, and local builds.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix(examples): persist useDevicePixels in URL params

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix(examples): handle unsupported Mapbox pixel ratio

* revert(examples): remove pixel ratio test pages

* fix(examples): clarify unset pixel ratio override

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