Release v0.19.1

Changes from 0.19.0 to 0.19.1

What's Changed

• fix(auth): update setup login copy and static auth logo by @cpacker in #1421
• feat: add GPT-5.4 mini and nano model presets by @kl2806 in #1422
• fix(subagents): handle CRLF/BOM frontmatter for custom agent files by @devanshrj in #1424
• feat(listen): isolate permission mode per conversation [LET-8050] by @4shub in #1425
• fix(plan-mode): dedupe bypass auto-approvals by tool_call_id by @jnjpng in #1426
• feat(listen): persist CWD and permission mode across restarts [LET-8048] by @4shub in #1428

Full Changelog: v0.19.0...v0.19.1