[FEATURE]: Desktop: Ctrl+Tab should cycle sessions by most-recently-used order (VS Code-style), not positional tab order

Problem

In OpenCode Desktop, Ctrl+Tab cycles through open session tabs in their fixed on-screen order (browser-style). In a multi-session workflow this rarely matches what I want: after opening a new session (Ctrl+N) to quickly check something, the natural next step is jumping straight back to the session I was just working in — but that one can be several positions away in the tab bar, so repeated Ctrl+Tab walks past every intermediate tab to get there.

Proposal

Make Ctrl+Tab / Ctrl+Shift+Tab cycle sessions in most-recently-used (MRU) order, like editor tab switching in Visual Studio Code: the most recently focused session comes first, so two presses always bounce between my two currently active sessions, regardless of where they sit in the tab bar. Keeping the current positional order as an option would be fine for those who prefer browser semantics.

This ordering fits agent workflows particularly well, because interleaving is constant: you start a fresh session for a quick question while another session keeps working, then want to return to it immediately — MRU makes exactly that pair adjacent.

Related reports

• #40557 — same "cycle through recent sessions" idea proposed for the TUI (session_next / session_previous)
• #37077 — general request for standard tab shortcuts (Ctrl+T, Ctrl+W, Ctrl+Tab) in the desktop/web app

Environment

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