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pydeck: bump frontend to ~9.3.*, fix widget JSON registration, add widget gallery examples (#10242)

* Prepare pydeck 0.9.3 release

Bump pydeck version 0.9.2 → 0.9.3 and lock frontend to deck.gl ~9.3.*.
Update bump_version.py to generate tilde-range semver (~X.Y.*) from lerna.json.

https://claude.ai/code/session_012C1gkGaLFxk6HMvN4VMrST

* Fix quote style to double quotes per Black formatter

https://claude.ai/code/session_012C1gkGaLFxk6HMvN4VMrST

* Add PopupWidget and InfoWidget to pydeck widget gallery example

Demonstrates the two new 9.3 widgets:
- PopupWidget: static HTML popup anchored at Heathrow Airport coordinates
- InfoWidget: hover-mode widget (getTooltip callback must be set on the JS side)

https://claude.ai/code/session_012C1gkGaLFxk6HMvN4VMrST

* Fix InfoWidget JSON registration and use @@= for getTooltip in example

create-deck.js was overwriting InfoWidget, ThemeWidget, and LoadingWidget
with undefined by referencing non-existent _-prefixed exports; those widgets
are already captured by extractElements. Removed the incorrect entries.

Update the widgets example to use @@= expression syntax for InfoWidget's
getTooltip, and drop "new in 9.3" labels.

https://claude.ai/code/session_012C1gkGaLFxk6HMvN4VMrST

* Register TimelineWidget in JSON converter configuration

https://claude.ai/code/session_012C1gkGaLFxk6HMvN4VMrST

* Revert pydeck version bump to 0.9.2

Not ready for release yet; keep frontend locked to ~9.3.* but hold
the Python package version at 0.9.2.

https://claude.ai/code/session_012C1gkGaLFxk6HMvN4VMrST

* fix(widgets): handle negative DMS degrees and guard InfoWidget tooltip expression

The dmsToDecimal function miscalculated when degrees were negative with
non-zero minutes/seconds (e.g. -37°48'00" → -36.2 instead of -37.8).
Also guard the InfoWidget example's @@= expression against undefined
object when hovering empty space.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* docs(pydeck): add 0.9.3 changelog, ... (continued)

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