[Bug] Desktop: all session tabs show the same avatar letter instead of per-project icons

Description

In OpenCode Desktop on Windows, every open session tab shows the same avatar — a letter icon with "C" — regardless of which project the session belongs to. With multiple projects open in parallel, the tab bar gives no visual way to tell sessions apart; the only differentiator left is the (truncated) tab title.

Per-project avatars in the tab bar are clearly intended: each tab renders a project avatar (session-tab-avatar.tsx, custom icon with an initial-letter fallback). In my case the differentiation is not happening.

Expected behavior

Each session tab shows its own project's icon, or when no custom icon is set, a distinct initial/color derived from that session's actual project — so tabs from different projects are visually distinguishable at a glance.

Observed behavior

All session tabs show an identical "C" letter avatar, independent of the underlying project.

Possible directions (from the source layout)

• The avatar falls back to displayName(project) initials — if all tabs resolve to the same project object (identity collision), they will legitimately render identically
• Or the shared/global project row's icon data leaks into per-project lookups, as reported for the sidebar in #39488
• Related identity bugs that could produce this: #44101 (clones of the same repo get the wrong project identity), #40094 (path-prefix collision opens the wrong project)

Environment

• App: OpenCode Desktop 1.18.21
• OS: Microsoft Windows 11 Education, 25H2, build 26200.8875

Happy to provide a screenshot of the tab bar or debug output about which project IDs my open sessions resolve to, if useful.