Overhaul networkUtils and expand auth

CHANGELOG.md

@@ -26,6 +26,13 @@ This refactor improves maintainability, testability, and documentation clarity a
 - Switched your share modal code to use a leading slash ("/api/file/share.php") so it generates absolute URLs instead of relative /share.php.
 - In the shared‑folder gallery, adjusted the client‑side image path to point at /uploads/... instead of /api/folder/uploads/...
 - Updated both AdminModel defaults and the AuthController to use the exact full path
+- Network Utilities Overhaul swapped out the old fetch wrapper for one that always reads the raw response, tries to JSON.parse it, and then either returns the parsed object on ok or throws it on error.
+- Adjusted your submitLogin .catch() to grab the thrown object (or string) and pass that through to showToast, so now “Invalid credentials” actually shows up.
+- Pulled the common session‑setup and “remember me” logic into two new helpers, finalizeLogin() (for AJAX/form/basic/TOTP) and finishBrowserLogin() (for OIDC redirects). That removed tons of duplication and ensures every path calls the same permission‑loading code.
+- Ensured that after you POST just a totp_code, we pick up pending_login_user/pending_login_secret, verify it, then immediately call finalizeLogin().
+- Expanded checkAuth.php Response now returns all three flags—folderOnly, readOnly, and disableUpload so client can handle every permission.
+- In auth.js’s updateAuthenticatedUI(), write all three flags into localStorage whenever you land on the app (OIDC, basic or form). That guarantees consistent behavior across page loads.
+- Made sure the OIDC handler reads the live config via AdminModel::getConfig() and pushes you through the TOTP flow if needed, then back to /index.html.
 
 ---