feat(app): isolate Code-side tab lists per project

CHANGELOG.md

@@ -305,22 +305,26 @@ configure`: **Login with SSO** (sign in with your CoDev account in the
   Two separate causes, both fixed: the close was recorded in two steps and the
   app reacted to the moment in between, and a folder you had never started a
   session in was not recognised as one you had closed.
-- **Each folder in a sandbox now has its own session tabs** — a sandbox can
-  mount several folders, but all of their sessions shared one tab strip on the
-  **Work** side, so working in two folders meant reading past the other one's
-  tabs. Every folder of every sandbox now keeps its own tabs, including the
-  project folder the sandbox was created with. Clicking a folder in the sidebar
-  takes you back to the session you were last in there — or to that folder's
-  draft, or to one of its open tabs, and only to a fresh new session when the
-  folder has nothing open at all. Tab shortcuts (`Ctrl`/`Cmd` +
-  number, next/previous tab, close tab) act within the folder you are looking
-  at, so closing the last tab in a folder no longer drops you into an unrelated
-  one. Two folders that happen to have the same name stay separate, and so does
-  the same folder mounted into two different sandboxes. **The Work strip now
-  shows one sandbox at a time**: while you are in one sandbox's folder, another
-  sandbox's tabs are not in the strip — selecting that sandbox brings them back.
-  Existing tabs keep their place; anything the app cannot immediately match to a
-  folder stays visible in that sandbox until it can. Code is unchanged.
+- **Every project now has its own session tabs** — sessions from unrelated
+  projects shared one tab strip, so working in two of them meant reading past
+  the other one's tabs. On **Work** that was every folder a sandbox mounts; on
+  **Code** every project of every server. Each now keeps its own tabs, including
+  the folder a sandbox was created with. Tab shortcuts (`Ctrl`/`Cmd` + number,
+  next/previous tab, close tab) act within the project you are looking at, so
+  closing the last tab in a project no longer drops you into an unrelated one,
+  and **New tab** starts in the project the strip is showing. Two projects that
+  happen to have the same name stay separate, and so does the same path on two
+  different servers — a folder mounted into two sandboxes, or a checkout that
+  your machine and a WSL distro both see. **The strip shows one server at a
+  time**: while you are in one server's project, another server's tabs are not
+  in the strip — opening one of its sessions brings them back. On **Work**,
+  clicking a folder in the sidebar takes you back to the session you were last
+  in there — or to that folder's draft, or to one of its open tabs, and only to
+  a fresh new session when the folder has nothing open at all. On **Code**,
+  clicking a project still just filters **Recents** as it always did, and the
+  strip follows whatever session you open. Existing tabs keep their place;
+  anything the app cannot immediately match to a project stays visible on its
+  own server until it can.
 - **Adding a folder to a sandbox no longer freezes the app** — mounting a new
   folder on a sandbox you had a session open on locked the window up entirely:
   no clicks, no typing, force quit the only way out. Applying a mount restarts