PKCE + state added to the browser authorization-code flow. Any callback whose state does not match is ignored, so another local process can no longer inject an authorization code.
v2 (v2.0) Entra endpoints are now used for both the authorization and token requests (scope= instead of the legacy resource=), aligning with the OAuth 2.1 public-client baseline.
Loopback listener hardened: switched from a raw TcpListener on a fixed port to System.Net.HttpListener on an ephemeral port (fixes collisions on multi-session RDS/AVD hosts and races between instances). All reflected error text is HTML-encoded, and a small branded landing page is shown after sign-in.
TLS 1.2/1.3 is enforced at startup on Windows PowerShell 5.1.
Uninstall now deletes the refresh-token cache and log (RefreshToken.xml is a usable credential and must never survive an uninstall).
Consent/sign-in failures no longer call Exit from deep in the request path (which silently killed the tray). They surface as an error balloon with the admin-consent URL and keep the tray alive for a retry.
Reliability
Access-token caching fixed: a valid cached access token is now reused instead of performing a full refresh-token exchange (+ DPAPI encrypt + disk write) on every API call. Token lifetime comes from expires_in with a 5-minute renewal margin; the refresh token is written to disk only when Entra rotates it.
Deletion circuit breaker: the delete phase is skipped (with a warning + balloon) when SharePoint Search returns incomplete results or the desired set shrank by more than $DeletionSafetyRatio. A tombstone model requires a target to be absent on $DeletionTombstoneRuns consecutive runs before deletion. $ForceReconcile overrides both.
Single-instance guard: a session mutex prevents two tray icons / token-rotation races / log contention. A second launch signals the running instance to run and exits.
Metadata lookup no longer aborts the whole run on one transient error; failed items are skipped with a warning.
Unified retry pipeline: Invoke-GraphRaw (config load/save) now retries transient 429/5xx/network errors, with correct Retry-After handling on both PowerShell 5.1 and 7.
Logging is written directly to lastRun.log (no longer dependent on Start-Transcript) and rotated (run-<timestamp>.log, keeping $LogHistoryCount).
Pre-flight checks warn (in one balloon) when OneDrive is not set up for a work account or the identity provider is unreachable.
Performance
Existing-shortcut metadata is fetched in a single RenderListDataAsStream call (with an automatic per-item fallback) instead of one call per shortcut.
The fixed Start-Sleep -Milliseconds 500 after every create/rename/delete was removed; throttling is handled by the shared retry/back-off.
UX
High-DPI: the process declares per-monitor-v2 DPI awareness and the floating progress bar scales with the display, so the UI is crisp at 125–200% scaling.
Manage shortcuts dialog: text filter, click-to-sort columns, Exclude-all/Include-all, and the window is resizable and remembers its size.
Periodic auto-refresh ($AutoRefreshHours, default off) re-runs on an interval while resident in the tray and shortly after the device resumes from sleep.
First-run onboarding balloon explains where the shortcuts are and points at Manage shortcuts.
Reduced the logon console flash on Windows 11 by launching through conhost.exe --headless.
Compatibility & correctness
PowerShell 7: large SharePoint JSON payloads use ConvertFrom-Json -AsHashtable instead of the .NET-Framework-only JavaScriptSerializer; Add-Type -AssemblyName replaces the deprecated LoadWithPartialName.
Wildcard exclusion/inclusion now uses PowerShell -like (correct anchor semantics). Note: exclusions tighten slightly — a trailing * is required for prefix matches (e.g. */sites/HR*).
Window-drag handler resolves the form at event time (dragging borderless dialogs works reliably).
