auto-git:

[add] src/AssistantMessageContent.jsx
 [add] src/appConfig.js
 [add] src/attachments.jsx
 [add] src/chatText.js
 [add] src/modelPicker.js

src/appConfig.js

@@ -0,0 +1,24 @@
+export const API_URL_KEY = 'backendApiUrl'
+export const COLOR_SCHEME_KEY = 'colorScheme'
+export const WEBSEARCH_URL_KEY = 'websearch.searxUrl'
+export const WEBSEARCH_ENGINES_KEY = 'websearch.engines'
+export const CHAT_LIBRARY_MAP_KEY = 'chat.libraryBySession'
+export const DEFAULT_SEARX_URL = 'http://127.0.0.1:8888'
+export const DEFAULT_BACKEND_API_URL = import.meta.env.VITE_API_URL ?? 'http://127.0.0.1:8000'
+export const MAX_IMAGE_ATTACHMENTS = 6
+export const MAX_IMAGE_ATTACHMENT_BYTES = 20 * 1024 * 1024
+export const MAX_AUDIO_RECORDING_MS = 5 * 60 * 1000
+export const AUDIO_RECORDING_TICK_MS = 200
+export const TOP_ALIGN_OFFSET = 48
+export const BOTTOM_EPSILON = 24
+
+export function resolveBackendApiUrl(settings) {
+  return settings?.backendApiUrl || settings?.ollamaApiUrl || DEFAULT_BACKEND_API_URL
+}
+
+export function migrateLegacySearxUrl(value) {
+  const trimmed = typeof value === 'string' ? value.trim() : ''
+  if (!trimmed) return DEFAULT_SEARX_URL
+  if (trimmed === 'http://localhost:8888') return DEFAULT_SEARX_URL
+  return trimmed
+}