Web UI: render a wider-than-viewport PTY without wrapping

[edwin-zvs]

When the TUI and web UI view the same session and the PTY width is owned by the TUI (wider than the web viewport), the web terminal wrapped the too-wide output. This renders the passive web viewer at the PTY's real column count and scrolls horizontally instead — like the TUI's pinned-tile rendering, but scroll rather than scale (per design: wrapping-only, rows untouched).

Why it needs a daemon change

The live Pty event carries only bytes — no size — and pty_resize didn't broadcast, so a passive web client never learned the owning client's width.

Changes

Daemon

• New transient SessionEvent::PtyResize { cols, rows }, broadcast (not persisted) from SessionManager::pty_resize on an actual size change.
• The no-op match arms a new SessionEvent variant requires (daemon summary classifier; TUI render/classify in cli).

Web UI

• Track PTY size per session (initial from pty_replay, live from PtyResize).
• When this terminal does not own geometry (!webPtyRecentlyEngaged()) and the PTY is wider than our fit, size xterm to the PTY cols and scroll horizontally (.terminal-host.pty-wide → overflow-x:auto) instead of wrapping; snap back to our own fit when we take over (click/type → claim). Rows left to the local fit.

⚠️ Testing — needs a daemon rebuild

Unlike the prior webui PRs, this isn't fully hot-reload-testable: the PtyResize broadcast is daemon code, so the daemon must be rebuilt + restarted. To verify:

1. cargo build + restart the daemon; re-point webui_hot_reload at this worktree's assets.
2. Open the same PTY session in the TUI and the web UI.
3. In the TUI, make the terminal wider than the web viewport → the web terminal should show the full width with a horizontal scrollbar, not wrapped text.
4. Click/type in the web terminal → it claims geometry and snaps back to its own fit.

The xterm horizontal-overflow rendering + touch pan-x are the parts to verify live (esp. on mobile). CI builds + tests the whole workspace.

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