[LLM Classification] Do not HTML-encode re-used tags again (#573)

* [LLM Classification] Do not HTML-encode re-used tags again

The tags of an entry are stored HTML-encoded: `applyClassification()`
encodes the tags returned by the LLM with `htmlspecialchars()`, like
SimplePie does for the categories of the feeds.

When an already classified entry is updated without any change to its
prompt, the extension re-uses the stored tags instead of calling the
LLM again, but passed them as-is to `applyClassification()`, which
encoded them a second time. So a tag such as `R&D` became `R&D` in
the database after classification, then `R&D` after the next
such update, and so on. When a list of allowed tags is configured, the
encoded tags did not match the list anymore (`R&D` is not `R&D`),
and were silently removed from the entry.

Decode the stored tags before re-using them, so that they go through
the same encoding and allow-list check as the tags returned by the LLM.
Decoding first also lets tags match a configured prefix containing such
characters.

Bump the extension version to 0.3.2.

* [LLM Classification] Decode single quotes in re-used tags too

xExtension-LlmClassification/extension.php

@@ -439,7 +439,11 @@ final class LlmClassificationExtension extends Minz_Extension {
 			if ($existingPromptHash === $incomingPromptHash) {
 				// Re-use existing tags matching the prefix
 				$prefix = $this->getUserConfigurationString('tag_prefix') ?? '';
-				$existingTags = $existingEntry->tags();
+				// Decode the stored tags before re-adding them (will be HTML-encoded again in applyClassification)
+				$existingTags = array_map(
+					static fn(string $tag) => htmlspecialchars_decode($tag, ENT_QUOTES),
+					$existingEntry->tags()
+				);
 				if ($prefix !== '') {
 					$existingTags = array_values(array_filter(
 						$existingTags,

xExtension-LlmClassification/metadata.json

@@ -2,7 +2,7 @@
 	"name": "LLM Classification",
 	"author": "Alkarex",
 	"description": "Tag incoming articles by calling an OpenAI-compatible LLM API",
-	"version": "0.3.1",
+	"version": "0.3.2",
 	"entrypoint": "LlmClassification",
 	"type": "user",
 	"compatibility": "1.28.2"