Hide locationless schematic simulation text

[ShiboSoftwareDev]

What changed

The converter now uses the AltiumTS fix from tscircuit/altiumts#84 and updates the two affected HERON schematic snapshots.

Why

Some Altium simulation settings are stored as text parameter records without a position. AltiumTS previously gave those records a made-up (0, 0) position, causing several unrelated simulation strings to appear on top of each other at the lower-left of both the source and converted views.

The AltiumTS fix skips text that has no source position. The converter itself does not need special handling: pinning the renderer fix removes the false text from both panes while keeping all positioned schematic text unchanged.

Visual verification

• HERON PAY-SSM: the simulation-text pile disappears from the lower edge in both source and converted views.
• HERON Systems PCB: the same false lower-edge text disappears from both views.
• Both snapshots were regenerated directly by Bun's SVG snapshot matcher.

Testing

• bun test --max-concurrency=1 — 52 passed, 0 failed
• bun run format:check
• bun run typecheck

Depends on tscircuit/altiumts#84.