Upgrade viewer export format to v2 with per-pose FOV and loop mode

[slimbuck]

Summary

• Upgrade ExperienceSettings to version 2, adding support for cameras, annotations, post-effect settings, tonemapping, and start mode configuration
• Add per-pose FOV: each camera keyframe now stores and interpolates its own field of view, computed from camera intrinsics when loading pose files
• Add loop mode selector (none/repeat/ping pong) to export and publish dialogs, replacing the animation dropdown
• Refactor fly-mode look rotation into Camera.look(), fixing camera drift during tween convergence by pinning the camera position until the azim/elev tween completes
• Use fixed-size camera pose gizmos instead of scaling relative to scene bounds
• Change publish success link to point to the scene edit page
• Add missing loop-mode translations for all 9 locales

Details

The viewer export format is restructured around a cameras array with CameraPose objects (position, target, fov) and a startMode field instead of the previous camera.startAnim/camera.animTrack approach. Animation tracks now include per-keyframe FOV values in the spline interpolation (7 values per keyframe instead of 6). The "Start Position" selector and per-splat export selector have been removed in favor of always using the current viewport and exporting all splats.

The fly-mode camera look was moved from PointerController into Camera.look() with a new lookCameraPos field that holds the camera position fixed while the azim/elev tween smoothly converges, preventing visible drift.

[Copilot]

Pull request overview

This PR upgrades the viewer export/publish settings format to v2, adding per-pose FOV support and a new loop-mode selector while refactoring camera fly-look behavior to reduce drift.

Changes:

• Introduces ExperienceSettings v2 fields (cameras array, startMode, post effects, tonemapping, etc.) and updates export/publish dialogs accordingly.
• Adds per-pose FOV to camera pose loading/serialization and includes FOV in spline keyframe interpolation.
• Replaces the export/publish animation dropdown with an animation toggle + loop-mode selector; updates camera fly-look implementation and pose gizmo sizing.

Reviewed changes

Copilot reviewed 23 out of 23 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
static/locales/en.json	Adds loop-mode strings for export UI.
static/locales/de.json	Adds loop-mode strings for export UI.
static/locales/es.json	Adds loop-mode strings for export UI.
static/locales/fr.json	Adds loop-mode strings for export UI.
static/locales/ja.json	Adds loop-mode strings for export UI.
static/locales/ko.json	Adds loop-mode strings for export UI.
static/locales/pt-BR.json	Adds loop-mode strings for export UI.
static/locales/ru.json	Adds loop-mode strings for export UI.
static/locales/zh-CN.json	Adds loop-mode strings for export UI.
src/ui/scss/settings-dialog.scss	Adjusts dialog header styling and boolean alignment.
src/ui/scss/export-popup.scss	Aligns boolean toggle styling in export popup.
src/ui/publish-settings-dialog.ts	Updates publish settings UI/serialization to ExperienceSettings v2 and loop mode selection.
src/ui/export-popup.ts	Updates viewer export settings to ExperienceSettings v2 and loop mode selection; removes per-splat selection.
src/splat-serialize.ts	Defines v2 settings types (cameras, annotations, post effects) and expands anim keyframes to include FOV.
src/splat-overlay.ts	Updates overlay primitive count update handling on sorter updates.
src/publish.ts	Changes publish success link target to scene edit page.
src/file-handler.ts	Computes per-pose FOV from intrinsics when loading pose files.
src/editor.ts	Extends camera pose get/set to include optional FOV.
src/doc.ts	Passes document camera FOV into pose deserialization path.
src/controllers.ts	Delegates fly-look rotation to Camera.look().
src/camera.ts	Adds Camera.look() and pins camera position during fly-look tween convergence.
src/camera-poses.ts	Adds per-pose FOV to pose data model and spline interpolation/serialization.
src/camera-pose-gizmos.ts	Uses fixed-size camera pose gizmos.

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[slimbuck]

Addressed Copilot feedback:

1. fov optional on Pose — Made fov?: number on the Pose type since addPose already defensively fills a default via ??=.

2. Duplicated defaultPostEffectSettings — Extracted to splat-serialize.ts alongside the PostEffectSettings type. Both export-popup.ts and publish-settings-dialog.ts now import it from there.

3. listed: false hardcoded — This is intentional; the listed field is being deprecated on the platform side.