Let users write three more CEL constructs in the filter field, each compiled to
SQL across SQLite/MySQL/Postgres:
- Scalar startsWith()/endsWith() on content/filename/mime_type (case-insensitive)
- matches() regex: PG ~, MySQL/SQLite REGEXP (Go-backed SQLite fn), validated at
compile time via cel.ValidateRegexLiterals()
- all() comprehension over tags via per-element subqueries, non-empty required
Also: contains() now escapes LIKE metacharacters (%, _, \); cross-dialect render
tests plus behavioral tests; cel-go bumped to v0.28.1; new operators surfaced in
the frontend shortcut guide.
Add custom memos_unicode_lower() SQLite function to enable proper
case-insensitive text search for non-English languages (Cyrillic,
Greek, CJK, etc.).
Previously, SQLite's LOWER() only worked for ASCII characters due to
modernc.org/sqlite lacking ICU extension. This caused searches for
non-English text to be case-sensitive (e.g., searching 'блины' wouldn't
find 'Блины').
Changes:
- Add store/db/sqlite/functions.go with Unicode case folding function
- Register custom function using golang.org/x/text/cases.Fold()
- Update filter renderer to use custom function for SQLite dialect
- Add test for Unicode case-insensitive search
- Make golang.org/x/text a direct dependency
Fixes#5559
