feat: thinking blocks rendered in tui and share page

packages/tui/internal/components/chat/message.go

@@ -208,6 +208,7 @@ func renderText(
 	showToolDetails bool,
 	width int,
 	extra string,
+	isThinking bool,
 	fileParts []opencode.FilePart,
 	agentParts []opencode.AgentPart,
 	toolCalls ...opencode.ToolPart,
@@ -219,8 +220,15 @@ func renderText(
 	var content string
 	switch casted := message.(type) {
 	case opencode.AssistantMessage:
+		bg := t.Background()
+		if isThinking {
+			bg = t.BackgroundPanel()
+		}
 		ts = time.UnixMilli(int64(casted.Time.Created))
-		content = util.ToMarkdown(text, width, t.Background())
+		content = util.ToMarkdown(text, width, bg)
+		if isThinking {
+			content = styles.NewStyle().Background(bg).Foreground(t.TextMuted()).Render("Thinking") + "\n\n" + content
+		}
 	case opencode.UserMessage:
 		ts = time.UnixMilli(int64(casted.Time.Created))
 		base := styles.NewStyle().Foreground(t.Text()).Background(backgroundColor)
@@ -385,6 +393,16 @@ func renderText(
 			WithBorderColor(t.Secondary()),
 		)
 	case opencode.AssistantMessage:
+		if isThinking {
+			return renderContentBlock(
+				app,
+				content,
+				width,
+				WithTextColor(t.Text()),
+				WithBackgroundColor(t.BackgroundPanel()),
+				WithBorderColor(t.BackgroundPanel()),
+			)
+		}
 		return renderContentBlock(
 			app,
 			content,

packages/tui/internal/components/chat/messages.go

@@ -369,6 +369,7 @@ func (m *messagesComponent) renderView() tea.Cmd {
 								m.showToolDetails,
 								width,
 								files,
+								false,
 								fileParts,
 								agentParts,
 							)
@@ -448,6 +449,7 @@ func (m *messagesComponent) renderView() tea.Cmd {
 									m.showToolDetails,
 									width,
 									"",
+									false,
 									[]opencode.FilePart{},
 									[]opencode.AgentPart{},
 									toolCallParts...,
@@ -469,6 +471,7 @@ func (m *messagesComponent) renderView() tea.Cmd {
 								m.showToolDetails,
 								width,
 								"",
+								false,
 								[]opencode.FilePart{},
 								[]opencode.AgentPart{},
 								toolCallParts...,
@@ -546,6 +549,35 @@ func (m *messagesComponent) renderView() tea.Cmd {
 							lineCount += lipgloss.Height(content) + 1
 							blocks = append(blocks, content)
 						}
+					case opencode.ReasoningPart:
+						if reverted {
+							continue
+						}
+						text := "..."
+						if part.Text != "" {
+							text = part.Text
+						}
+						content = renderText(
+							m.app,
+							message.Info,
+							text,
+							casted.ModelID,
+							m.showToolDetails,
+							width,
+							"",
+							true,
+							[]opencode.FilePart{},
+							[]opencode.AgentPart{},
+						)
+						content = lipgloss.PlaceHorizontal(
+							m.width,
+							lipgloss.Center,
+							content,
+							styles.WhitespaceStyle(t.Background()),
+						)
+						partCount++
+						lineCount += lipgloss.Height(content) + 1
+						blocks = append(blocks, content)
 					}
 				}
 			}

packages/tui/internal/tui/tui.go

@@ -423,6 +423,8 @@ func (a Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 					switch casted := p.(type) {
 					case opencode.TextPart:
 						return casted.ID == msg.Properties.Part.ID
+					case opencode.ReasoningPart:
+						return casted.ID == msg.Properties.Part.ID
 					case opencode.FilePart:
 						return casted.ID == msg.Properties.Part.ID
 					case opencode.ToolPart:
@@ -461,6 +463,8 @@ func (a Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 					switch casted := p.(type) {
 					case opencode.TextPart:
 						return casted.ID == msg.Properties.PartID
+					case opencode.ReasoningPart:
+						return casted.ID == msg.Properties.PartID
 					case opencode.FilePart:
 						return casted.ID == msg.Properties.PartID
 					case opencode.ToolPart: