Per-tab projects, «Zuletzt geschlossen», new-version notice

CLAUDE.md

@@ -23,7 +23,8 @@ There are no tests. `.github/workflows/ci.yml` runs `npm ci`, the build (tsc cat
 - `src/App.tsx` — the shell. It renders `GlPythonWorkspace` (stacked layout; its buttons go into the bar through `actionsContainer`, every file is a tab with `closeFileTabs: false`) and uses glpython-editor's project helpers (`addProjectFile`, `renameProjectFile`, …).
 - `src/index.css` — the shell's styles (`ide-*` classes), from glpython-editor's `--glp-*` tokens. glpython-editor's `style.css` styles only the workspace (plus `icon-button`, `hidden-input` and `auth-notice`, which the shell uses too).
 - `src/i18n.ts` — only the shell's own strings (`ShellStrings`, de/en). The workspace's strings come from glpython-editor's `coreStrings`, so don't copy them here. A new workspace string goes into glpython-editor's `src/i18n.ts`.
-- `src/projectStorage.ts` (local storage, folder/ZIP) and `src/projectShare.ts` (`?project=` share links, lz-string, versioned payload).
+- `src/tabProjects.ts`: per-tab projects (P25). The tab's id is in sessionStorage and `history.state` (never in the address); projects are in localStorage, one entry per id. Nothing is deleted when a tab goes away: a page can't tell a close from iPad Safari unloading it (only `history.state` survives that). Open tabs answer over a BroadcastChannel, which finds duplicated tabs and the projects for «Zuletzt geschlossen».
+- `src/projectStorage.ts` (folder/ZIP) and `src/projectShare.ts` (`?project=` share links, lz-string, versioned payload).
 - `src/auth.ts` — MSAL. Only active with `VITE_ENTRA_CLIENT_ID` in `.env.local` (README «Microsoft sign-in»).
 - `vite.config.ts` — `optimizeDeps.exclude: ['glpython-editor']` keeps the editor's worker next to its `dist/index.js`. Don't remove it.
 

README.md

@@ -68,8 +68,33 @@ language settings and then remembered per browser via local storage.
 
 ## Project persistence
 
-The current project is saved automatically in browser local storage. The
-⋮ menu and the bar support:
+**Each browser tab has its own project** (as in WebTigerPython), saved
+automatically in the browser:
+
+- Opening a share link starts a new tab project; it never replaces the work in
+  another tab. The address bar then shows only the start page, so there is no
+  link to copy from it - links come from **Teilen**.
+- A reload keeps the tab's project, and so does iPad Safari rebuilding a
+  background tab. The tab's id is kept in its session storage and its history
+  entry (`history.state`), never in the address.
+- **Closing or reloading** a tab whose project changed since the last
+  **Teilen** or **Projekt herunterladen** brings the browser's own question
+  (desktop browsers; iPad Safari never asks).
+- A closed tab's project is kept for 14 days: ⋮ **Zuletzt geschlossen** lists
+  them («Öffnen» in this tab if it holds only the untouched starter, else in a
+  new tab; «Entfernen»). A new tab offers the last one changed within a day
+  right away («Zuletzt bearbeitet: auswerter.py (vor 2 Stunden).» · «Öffnen»),
+  since after quitting Safari or restarting the iPad a tab comes back empty.
+- ⋮ **Neues Projekt** gives the tab the starter; opening a folder or a ZIP
+  gives it that project. The one before goes to «Zuletzt geschlossen».
+- The one project the IDE kept before per-tab projects becomes the first
+  tab's project, once.
+- A tab that stays open notices a newer IDE version (`version.json`, written
+  by the build, checked when the tab comes back into view and every 30
+  minutes): «Neue Version verfügbar.» · «Neu laden». The code survives the
+  reload; Python's session doesn't.
+
+The ⋮ menu and the bar support:
 
 - **Ordner öffnen** in browsers with the File System Access API
 - **Projekt öffnen** (a ZIP) in all modern browsers with file upload support

package.json

@@ -12,7 +12,7 @@
   },
   "dependencies": {
     "@azure/msal-browser": "^5.22.0",
-    "glpython-editor": "git+https://github.com/glpython-edu/glpython-editor.git#v0.1.19",
+    "glpython-editor": "git+https://github.com/glpython-edu/glpython-editor.git#v0.1.20",
     "jszip": "^3.10.2",
     "lucide-react": "^1.47.0",
     "lz-string": "^1.5.0",