Fix migrations and deploy issues + errors + linting

- scan both pending/ and applied/ dirs so remote catch-up works
- fix remote 500s: run.php handles per-statement errors so VIEW rebuilds run after duplicate columns; replace mb_strimwidth with substr (no mbstring extension on server)
- add missing migration: 015_license_custom.sql (column existed in schema.sql but was never migrated)
- remote: fgetcsv enclosure single-char + AdminLogger permission-denied
guard + deploy always migrates
- fix admin-filters wrapping: restore flex-wrap, flex-basis on
inputs/selects, shrink-protect buttons
- fix phpstan: remove redundant ?? [] after isset guard in
ThesisEditController
- biome: exclude vendored min.js via includes patterns;
lint whole js dir; modernise beforeunload-guard.js

app/src/AdminLogger.php

@@ -257,7 +257,9 @@ class AdminLogger
         }
 
         $line = json_encode($entry, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE) . "\n";
-        error_log($line, 3, $this->logFile);
+        if (is_writable($this->logFile) || (!file_exists($this->logFile) && is_writable(dirname($this->logFile)))) {
+            error_log($line, 3, $this->logFile);
+        }
 
         if ($this->db !== null) {
             $this->insertDb($resource, $action, $status, $context);