Recommendations ignore descriptions in Chinese, Japanese and other scripts without letter case #1395

NeuroTokenizer.extractDescriptionKeywords drops every description line that equals its own uppercase (line.trim() == line.trim().uppercase(), meant to skip shouted lines like "SUBSCRIBE NOW"). Chinese, Japanese, Thai and other scripts have no letter case, so every line passes that check and is dropped. Descriptions in these languages never give keywords.

Found by @Chiehx0220 while working on #1366.

Where: app/src/main/java/io/github/aedev/flow/data/recommendation/NeuroTokenizer.kt, the content-line filter in extractDescriptionKeywords.

Expected: only skip a line as all-caps when it has cased letters, e.g. when line.any { it.isLetter() && it.isUpperCase() } and no lowercase letters.

Related: #1341.