Fix Internet Commute rider lifecycle and Slow Mode boarding

[spencerc99]

Summary

• Count active PlayHTML users instead of retained train assignments so departed riders disappear from the carriage count.
• Show every Slow Mode rider the full local train pull-up and boarding intro, including riders joining a train already in progress. Keep the cursor on the platform and let the train occlude it at the doorway.
• Reboard riders after a completed route so the page does not remain at home station with “a fresh route is forming.”

Root cause

The UI used the dispatcher assignment count for live occupancy. Slow Mode also derived its intro from the shared train creation time, so late riders skipped it, while the boarding phase immediately hid the cursor. Completed assignments were refreshed with the same rider token and returned the completed route instead of starting the next trip.

Verification

• bun run test:extension (140 files, 903 tests)
• bun run check:extension
• bun run check:extension-website
• Built the MV3 extension and automated the persisted Slow Mode ride, service worker, content-script bridge, hosted commute, production train assignment, train arrival, cursor boarding, and carriage handoff in isolated Chromium.
• Captured waiting, arrival, and boarding states at 1440 × 1100. Visual evidence is attached in the PR Evidence comment.

Release notes

Updated extension/PENDING.md. No extension permissions changed.

[pkg-pr-new]

Open in StackBlitz

bun add https://pkg.pr.new/@playhtml/common@440

bun add https://pkg.pr.new/playhtml@440

bun add https://pkg.pr.new/@playhtml/react@440

commit: bb21a1a

[spencerc99]

Preview evidence

Fixes live rider cleanup, Slow Mode boarding, platform cursor placement, and completed-route restart.

Open preview · Review all evidence · Commit bb21a1a

Waiting on the platform

The local cursor is fully above the yellow platform edge before the train arrives.

Open captured page · 1440×1100

Train arriving

The train pulls in front of the cursor while the cursor remains on the platform side of the yellow edge.

Open captured page · 1440×1100

Cursor boarding

The train occludes the cursor at the doorway; no cursor is drawn on the train body or on the track side of the yellow edge.

Open captured page · 1440×1100

_{Published by PR Evidence. Media is temporary and is removed after retention expires.}

[cloudflare-workers-and-pages]

Deploying we-were-online-website with    Cloudflare Pages

Latest commit:	bb21a1a
Status:	✅  Deploy successful!
Preview URL:	https://b5594c5a.we-were-online-website.pages.dev
Branch Preview URL:	https://cx-commute-presence-boarding.we-were-online-website.pages.dev

View logs

[spencerc99]

Code review

No issues found. Checked for bugs and project-instruction compliance.