Release v0.1.6

• Sessions: Remapped new-session shortcuts from Cmd/Ctrl + N / Cmd/Ctrl + Shift + N to bare N / Shift + N so they work without a modifier when the chat input is not focused. (@isomoes)
• Sessions: Changed session-switching shortcuts from Ctrl + J / Ctrl + K to Shift + J / Shift + K to avoid conflicts with Vim-style line scrolling. (@isomoes)
• Chat: Changed the model selector shortcut from Cmd/Ctrl + Shift + M to Cmd/Ctrl + M for easier one-handed access. (@isomoes)
• Server: The web server and dev proxy now respect the standard PORT environment variable in addition to IKANBAN_PORT. (@isomoes)
• Server: HTTPS proxy settings (IKANBAN_OPENCODE_HTTPS_PROXY / OPENCODE_HTTPS_PROXY) are now correctly forwarded to the OpenCode SDK at startup. (@isomoes)