继续重构会话消息处理逻辑

src/lib/adapters/ai-elements-adapter.ts

@@ -746,85 +746,3 @@ export function adaptMessageTurns(
     adaptMessageTurn(turn, text, streamingIndices?.has(i) ?? false)
   )
 }
-
-/**
- * A visual message group that merges consecutive assistant/tool turns
- * into a single block, split only by user or system messages.
- */
-export interface MessageGroup {
-  id: string
-  role: "user" | "assistant" | "system"
-  parts: AdaptedContentPart[]
-  userResources?: UserResourceDisplay[]
-  userImages?: UserImageDisplay[]
-  usage?: TurnUsage | null
-  duration_ms?: number | null
-  model?: string | null
-  models?: string[]
-}
-
-function mergeUsage(
-  a: TurnUsage | null | undefined,
-  b: TurnUsage | null | undefined
-): TurnUsage | null {
-  if (!a && !b) return null
-  if (!a) return b!
-  if (!b) return a
-  return {
-    input_tokens: a.input_tokens + b.input_tokens,
-    output_tokens: a.output_tokens + b.output_tokens,
-    cache_creation_input_tokens:
-      a.cache_creation_input_tokens + b.cache_creation_input_tokens,
-    cache_read_input_tokens:
-      a.cache_read_input_tokens + b.cache_read_input_tokens,
-  }
-}
-
-/**
- * Group adapted messages so that consecutive assistant/tool messages
- * are merged into one visual block, matching Claude Code terminal UX.
- */
-export function groupAdaptedMessages(
-  messages: AdaptedMessage[]
-): MessageGroup[] {
-  const groups: MessageGroup[] = []
-  let currentGroup: MessageGroup | null = null
-
-  for (const msg of messages) {
-    const effectiveRole = msg.role === "tool" ? "assistant" : msg.role
-
-    if (effectiveRole === "user" || effectiveRole === "system") {
-      currentGroup = null
-      groups.push({
-        id: msg.id,
-        role: effectiveRole,
-        parts: [...msg.content],
-        userResources: msg.userResources,
-        userImages: msg.userImages,
-      })
-    } else {
-      if (currentGroup && currentGroup.role === "assistant") {
-        currentGroup.parts.push(...msg.content)
-        currentGroup.usage = mergeUsage(currentGroup.usage, msg.usage)
-        currentGroup.duration_ms =
-          (currentGroup.duration_ms ?? 0) + (msg.duration_ms ?? 0)
-        if (msg.model && !currentGroup.models?.includes(msg.model)) {
-          currentGroup.models = [...(currentGroup.models ?? []), msg.model]
-        }
-      } else {
-        currentGroup = {
-          id: msg.id,
-          role: "assistant",
-          parts: [...msg.content],
-          usage: msg.usage,
-          duration_ms: msg.duration_ms,
-          model: msg.model,
-          models: msg.model ? [msg.model] : [],
-        }
-        groups.push(currentGroup)
-      }
-    }
-  }
-
-  return groups
-}

src/lib/types.ts

@@ -80,13 +80,6 @@ export type ContentBlock =
     }
   | { type: "thinking"; text: string }
 
-export interface UnifiedMessage {
-  id: string
-  role: MessageRole
-  content: ContentBlock[]
-  timestamp: string
-}
-
 export type TurnRole = "user" | "assistant" | "system"
 
 export interface TurnUsage {