fix: use mzi-1x2/mzi-2x2 symbol types instead of mzi

[pepijndevos]

Summary

cspdk emitted schematic("mzi", ...) with symbol "mzi", but Mosaic's device-types only knows mzi-1x2 and mzi-2x2. Mosaic coerced the unknown type to "ckt" (editor.cljc:3070); Livewire wrote the raw invalid "mzi" into the .gsch. This caused MZI cells to render as generic boxes in Mosaic and carry an invalid type in Livewire.

Changes

• cband/oband (4-port _2X2): mzi → mzi-2x2
• si340/si500/sin200/sin300 (3-port _MZI_1X2): mzi → mzi-1x2

All 6 cspdk _schematic.py files updated. Verified: all variants return the correct symbol name and port count.

Related

• gdsfactoryplus PR: https://github.com/doplaydo/gdsfactoryplus/pull/3617 (restore symbol SVG generation — the ? placeholder fix)
• gdsfactoryplus issue: https://github.com/doplaydo/gdsfactoryplus/issues/3615

Summary by Sourcery

Bug Fixes:

• Use the correct mzi-1x2 and mzi-2x2 schematic symbol type names so MZI cells render properly and carry valid device types in Mosaic and Livewire.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Aligns CSPDK MZI schematic symbol types with Mosaic-supported device types by updating all MZI schematics to use mzi-1x2 or mzi-2x2 instead of the unsupported mzi symbol, ensuring correct port counts and rendering in Mosaic/Livewire.

File-Level Changes

Change	Details	Files
Update 4‑port MZI schematics to use the mzi-2x2 symbol type instead of the unsupported mzi type.	Change the schematic type string from "mzi" to "mzi-2x2" for cband MZI schematics while keeping the _2X2 port configuration. Change the schematic type string from "mzi" to "mzi-2x2" for oband MZI schematics while keeping the _2X2 port configuration.	cspdk/si220/cband/_schematic.py cspdk/si220/oband/_schematic.py
Update 3‑port MZI schematics to use the mzi-1x2 symbol type instead of the unsupported mzi type.	Change the schematic type string from "mzi" to "mzi-1x2" in si340 MZI schematic definitions while keeping the _MZI_1X2 configuration. Change the schematic type string from "mzi" to "mzi-1x2" in si500 MZI schematic definitions while keeping the _MZI_1X2 configuration. Change the schematic type string from "mzi" to "mzi-1x2" in sin200 MZI schematic definitions while keeping the _MZI_1X2 configuration. Change the schematic type string from "mzi" to "mzi-1x2" in sin300 MZI schematic definitions while keeping the _MZI_1X2 configuration.	cspdk/si340/_schematic.py cspdk/si500/_schematic.py cspdk/sin200/_schematic.py cspdk/sin300/_schematic.py

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