fix: neutral hint form for remaining client-facing tool mentions, Limits bounds accessor

Fix round 1 (task 10 review):
- FieldValidator's "unknown field" validation error (reaches the
  client via validation_failed's fields) and PostPresenter's
  DIVI_HINT (surfaced in the result's hints array) still named
  lit-content-types/lit-content-update as plain lit-<name>; converted
  both to the neutral "lit/<name> (direkt: lit-<name>)" form like the
  other hints from task 10. Re-grepped src/ for any other client-facing
  error/field/hints text naming a direct-by-default tool as lit-<name>
  (descriptions/schemas excluded per Q11c) - none left.
- Added Limits::bounds() (field => [min, max]) and made LimitsTab use
  it for the number inputs' min/max instead of a second, hardcoded
  copy of the same bounds.
- LimitsTab now shows a description note when the configured upload_mb
  exceeds wp_max_upload_size() (PHP's upload_max_filesize/post_max_size),
  since WordPress would refuse a larger upload before this limit ever
  applies.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01At3V6SjwbMe6eMzVGW3Hs7

src/Admin/LimitsTab.php

@@ -40,16 +40,18 @@ final class LimitsTab implements AdminTab
     public function render(): void
     {
         $values = (new Limits())->all();
-        $fields = [
-            'upload_mb' => [__('Maximale Upload-/Download-Größe (MB)', 'wp-lit-mcp'), 1, 100],
-            'log_retention_days' => [__('Protokoll aufbewahren (Tage)', 'wp-lit-mcp'), 1, 3650],
-            'snapshot_count' => [__('Anzahl Designsystem-Snapshots (ab Etappe 4)', 'wp-lit-mcp'), 1, 100],
+        $bounds = Limits::bounds();
+        $labels = [
+            'upload_mb' => __('Maximale Upload-/Download-Größe (MB)', 'wp-lit-mcp'),
+            'log_retention_days' => __('Protokoll aufbewahren (Tage)', 'wp-lit-mcp'),
+            'snapshot_count' => __('Anzahl Designsystem-Snapshots (ab Etappe 4)', 'wp-lit-mcp'),
         ];
 
         echo '<form method="post" action="options.php">';
         settings_fields(self::GROUP);
         echo '<table class="form-table"><tbody>';
-        foreach ($fields as $key => [$label, $min, $max]) {
+        foreach ($labels as $key => $label) {
+            [$min, $max] = $bounds[$key];
             printf(
                 '<tr><th scope="row"><label for="lit-mcp-%1$s">%2$s</label></th><td>'
                     . '<input id="lit-mcp-%1$s" type="number" min="%3$d" max="%4$d" name="%5$s[%1$s]" value="%6$d">'
@@ -63,7 +65,29 @@ final class LimitsTab implements AdminTab
             );
         }
         echo '</tbody></table>';
+        $this->maybeRenderUploadSizeNotice($values['upload_mb']);
         submit_button();
         echo '</form>';
     }
+
+    /**
+     * PHP's own upload_max_filesize/post_max_size (via wp_max_upload_size()) can be lower than
+     * what is configured here – WordPress itself would then refuse a large upload/download before
+     * this limit ever applies. A warning only, since the two are independent knobs.
+     */
+    private function maybeRenderUploadSizeNotice(int $uploadMb): void
+    {
+        $serverMaxMb = (int) floor(wp_max_upload_size() / (1024 * 1024));
+        if ($serverMaxMb <= 0 || $uploadMb <= $serverMaxMb) {
+            return;
+        }
+
+        $message = sprintf(
+            /* translators: 1: configured limit in MB, 2: server limit in MB */
+            __('%1$d MB übersteigt das Server-Limit von %2$d MB (upload_max_filesize/post_max_size).', 'wp-lit-mcp'),
+            $uploadMb,
+            $serverMaxMb
+        );
+        printf('<p class="description">%s</p>', esc_html($message));
+    }
 }