core: modern and half-louvered doors have a leaf

[AxiomeCG]

What does this PR do?

Modern and half-louvered doors have a leaf again.

• Modern: the preset was a single empty segment, which the door system draws as no leaf, so every modern door rendered as an open frame. It is now a flush panel over the whole leaf.

• Half-louvered: the preset built its slats from empty rows, leaving a hole over its top half. The slats are now ten raised bars (about 7 cm tall, 2.2 cm proud, 2.8 cm apart), deep and narrow enough to read.

• Panels on both faces: a panel segment's raised inner panel was drawn on the front face only, so a door seen from the hall was flat. It is now mirrored on the back face, for every panelled style (the shaped-top path is unchanged).

• The same styles by hand: a person picks the same styles from the panel or while placing; the agent and the panel write the same fields. The door and window panels gain a Style row under Type (it shows the style a door or window reads back as, or Custom when its leaf or panes match none), and the standalone editor's door and window tools gain the chips [O] Type and [L] Style, which the placed door or window takes. The door panel's Type logic moves into core (doorTypeFields, doorTypeChange), so the row, the chips and agents write the same fields; a style the person chose survives a type change.

• Type and style: Changing a door's Type keeps a Style the person chose (a modern door made sliding stays modern); a door still on its type's own leaf takes the new type's (hinged → French gets the French glazing).

• Renamed export (npm consumers of @pascal-app/core/building): getDoorStyleOverrides(style) is replaced by doorStyleLook(style), which returns the whole look (segments and contentPadding) where the old function returned only the fields a style changed ({} for panel). A door parsed from either is the same for every style. Its one caller in the hosted app moves in pascalorg/private-editor#846.

New viewer tests check that every door style's closed leaf covers its opening, and that six-panel, shaker and half-louvered doors show their panels on both faces.

How to test

0. By hand: place a door, select it, and set its Style to Modern in the door panel: a closed flush leaf. Set Half-louvered: ten slats on top, a panel below; orbit to the other side: the panels show there too. In the standalone editor's door tool, L cycles styles and O types before placing.
1. bun test packages/viewer/src/systems/door/door-styles.test.ts: 13 pass. Without this change, the modern and half-louvered leaf cases fail, and the three both-faces cases fail on the one-sided panels.
2. Over the MCP (or in a chat using these tools), ask for a modern door: add_door with style: 'modern' builds a flat leaf, not an open frame. Then a half-louvered door: ten slats on top, a panel below, no hole. Orbit to the other side: the panels show there too.
3. bun run ci is green.

Merge: merge this PR with a merge commit (not squash), so pascalorg/private-editor#846's submodule pin stays reachable; then #846.

Screenshots / screen recording

Not added yet.

Checklist

• I've tested this locally with bun dev
• My code follows the existing code style (run bun check to verify)
• I've updated relevant documentation (if applicable)
• This PR targets the main branch

🤖 Generated with Claude Code

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Note

Medium Risk
Touches door mesh generation and shared opening presets used by editor, agents, and a breaking doorStyleLook API rename; behavior is covered by new tests but placement and type/style merging affect many code paths.

Overview
Fixes modern and half-louvered doors so a closed leaf actually fills the opening (flush slab vs empty segments; slats as raised bars), and mirrors panel geometry on the back face so panelled styles read from either side.

Centralizes door/window type and style in @pascal-app/core/building: doorTypeFields / doorTypeChange (type changes keep a user-chosen style when it isn’t the type’s default leaf), doorStyleLook (replaces getDoorStyleOverrides with full segments + contentPadding), doorStylesOf / windowStylesOf, and windowTypeFields. Door and window panels get a Style row; placement tools share Type / Style chips (O / L) via new placement stores so previews, panel edits, and add_door stay aligned.

Adds core and viewer tests for type changes, style round-trips, leaf coverage, and double-sided panels.

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[AxiomeCG]

Folded into #1014, the sync bundle that brings this PR's content (with its review fixes and docs) together with the rest of the tested work, tested there by the owner. This PR stays as the review map for its part.