Restore the 9/29 session sidebar and Home

[ehrlich-b]

v0.148.3's one-line redesign dropped things people use (terminal thumbnails on Home), and the overnight land had changed the session dots from connection to agent activity and re-sorted sessions by state. This returns to the session UI accepted on 9/29 (v0.147.0 plus the org requests) and adds one requested change: sessions label themselves.

• Sidebar and Home are back to 9/29: connection dots, terminal thumbnails, name · agent, ⋯ and x, the hover rename on the row, and the filled header buttons. Search, filters, counts and project headers are gone. Fork moved into session details (Home ⋯, and the terminal title's info dialog).
• An unnamed session shows the title its agent sets for its terminal (Claude: "Math question"). The egg cleans the OSC title (no spinner glyph, plain characters only) and lists it as title. A chosen name still wins, then the folder. The open session's label updates as soon as the title changes.
• The wing lists sessions oldest first, so a reload no longer moves a new session into the middle.
• Fix: the egg's shadow terminal blocked forever on Claude 2.1.292's startup queries (ESC[>0q ESC[?u ESC[c), because its reply pipe was never read. That froze session_read and reconnect snapshots at the banner. It now drains and drops the replies.

What to look at: the screenshots against the 9/29 acceptance shots at 1920x934, and internal/egg/vterm.go (the drain, and closing it before the emulator).

Evidence: CI green including the org canary (46/46, with new checks for the Home thumbnail and connection dots), a race-checked egg suite, and a headless run on a work machine against bryan-wingthing: a fresh session answers and shows its title live, and the same session still answers after a roost restart.