tagQueryAt decides in one check, within detekt's return limit

Task #6316.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

android/app/src/main/java/com/fabledsword/inkwell/ui/TagSuggest.kt

@@ -37,14 +37,16 @@ fun tagQueryAt(
     text: String,
     caret: Int,
 ): TagQuery? {
-    if (caret < 0 || caret > text.length) return null
     var i = caret
     while (i > 0 && text[i - 1].isTagChar()) i--
-    if (i == 0 || text[i - 1] != '#') return null
     val hash = i - 1
-    if (hash > 0 && !text[hash - 1].isWhitespace()) return null
     val query = text.substring(i, caret)
-    if (query.isNotEmpty() && !Character.isAlphabetic(query[0].code)) return null
+    val inTag =
+        hash >= 0 &&
+            text[hash] == '#' &&
+            (hash == 0 || text[hash - 1].isWhitespace()) &&
+            (query.isEmpty() || Character.isAlphabetic(query[0].code))
+    if (!inTag) return null
     var end = caret
     while (end < text.length && text[end].isTagChar()) end++
     return TagQuery(start = hash, end = end, query = query)