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/templates/admin/contenus.php

@@ -105,7 +105,7 @@
                     <div class="fhb-block-info">
                         <span class="fhb-block-label"><?= htmlspecialchars($b['label']) ?></span>
                         <?php if (trim($b['content']) !== ''): ?>
-                        <span class="fhb-block-preview"><?= htmlspecialchars(mb_strimwidth(trim($b['content']), 0, 60, '…')) ?></span>
+                        <span class="fhb-block-preview"><?= htmlspecialchars(strlen($preview = trim($b['content'])) > 60 ? substr($preview, 0, 60) . '…' : $preview) ?></span>
                         <?php else: ?>
                         <span class="fhb-block-empty">— vide —</span>
                         <?php endif; ?>