fix(sessions): show all sessions across all projects (closes #48) (#50)

* fix(sessions): load all sessions across projects, not just active directory

Closes #48

Root cause: loadSessions() used connState.client which carries the
active connection's directory as x-opencode-directory header. The server
filters sessions by that directory, so only the current project's sessions
were visible.

Fix: call clientForDirectory(undefined) to get a no-header client.
The server then returns sessions from all projects.

The session row UI already showed a directory badge (shortDir from
session.directory), so no UI change is needed — each session already
displays its project folder name.

* fix(sessions): preserve directory when opening rows

Carry each listed session directory into the route so selection, messages, and follow-up operations use the matching project client.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/stores/connections.ts

@@ -43,8 +43,9 @@ interface ConnectionsState {
   ) => Promise<{ ok: boolean; error?: string }>
   updateConnection: (id: string, updates: Partial<ServerConnection>) => Promise<void>
   refreshProject: () => Promise<void>
-  // Create a one-off client pointing at a specific directory (for cross-project operations)
-  clientForDirectory: (directory: string) => Client | null
+  // Create a one-off client pointing at a specific directory (for cross-project operations).
+  // Pass undefined to get a directory-less client that queries the server without project scope.
+  clientForDirectory: (directory?: string) => Client | null
   // Switch the active connection's directory and reload
   switchDirectory: (directory?: string) => Promise<void>
   // Record a directory as recently used