feat(painting): add magnetic spray tray generator

[richardsolomou]

Problem

Batch priming several miniatures means holding each base or using a holder that blocks spray from reaching the base edge. Mixed base sizes also need more placement options than a single regular grid provides.

Changes

• I added a dedicated Spray tray generator with a low-profile, rimless platform and interleaved magnet pockets. The default 50mm spacing leaves clearance between 32mm bases on neighbouring primary and diagonal positions.
• I added separate glue-on round, oval, flared, and pistol grips with adjustable length, width, lean, end rounding, and ribs. The default is a straight 100mm grip, and an engraved + marks its glue position.
• I kept the tray and grip support-free by exporting separate STL files or separate 3MF build plates.
• I kept shared magnet settings synchronized, migrated saved workspaces, gave each generator its own camera view, and centred the spray-tray orbit on the grip axis.

Risk

Medium. The new geometry and workspace schema are isolated to the Spray tray generator, and existing workspaces gain safe defaults. Returning to a pre-v7 build after saving the new workspace can reset local settings because older builds do not recognize v7.

Verification

• Ran just check (format, lint, policy, typecheck, 262 unit tests, and production build).
• Ran just e2e-run (48 browser tests passed).
• Ran pnpm exec markdownlint-cli2 README.md AGENTS.md .changeset/bright-trays-paint.md.
• Exported the default tray and 100mm round grip with just samples painting; trimesh reported both STLs watertight.
• Inspected the assembled tray and clean default grip in the running browser.

Checklist

• Tests cover new or changed behavior where practical.
• Geometry changes are checked against a real export, not just the preview.
• User-facing behavior is documented in the README.

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	basekit	b2ae60e	Commit Preview URL Branch Preview URL	Sep 20 2026, 08:14 PM