fix: remove tab switching, filter AI thinking from responses

- Remove Tab/Shift+Tab for tab switching (use only Ctrl+T)
- Tab key now inserts tab character in chat/terminal input
- Filter <think...> blocks from AI responses (MiniMax etc.)
- Filter << >> reasoning blocks from AI responses

💘 Generated with Crush

Assisted-by: GLM-5.1 via Crush <crush@charm.land>

internal/orchestrator/orchestrator.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"regexp"
 	"strings"
 	"time"
 
@@ -127,7 +128,7 @@ func (o *Orchestrator) Send(userMessage string) (string, error) {
 		return "", fmt.Errorf("no response from AI")
 	}
 
-	content := chatResp.Choices[0].Message.Content
+	content := cleanAIResponse(chatResp.Choices[0].Message.Content)
 	o.history = append(o.history, Message{
 		Role:    "assistant",
 		Content: content,
@@ -222,6 +223,31 @@ func (o *Orchestrator) ClearHistory() {
 	o.Workflow.Reset()
 }
 
+func cleanAIResponse(content string) string {
+	thinkRe := regexp.MustCompile(`(?s)<[Tt]hink[^>]*>.*?</[Tt]hink>`)
+	content = thinkRe.ReplaceAllString(content, "")
+	lines := strings.Split(content, "\n")
+	var clean []string
+	inBlock := false
+	for _, line := range lines {
+		trimmed := strings.TrimSpace(line)
+		if trimmed == "<<" || trimmed == "<<<" {
+			inBlock = true
+			continue
+		}
+		if trimmed == ">>" || trimmed == ">>>" {
+			inBlock = false
+			continue
+		}
+		if inBlock {
+			continue
+		}
+		clean = append(clean, line)
+	}
+	result := strings.TrimSpace(strings.Join(clean, "\n"))
+	return result
+}
+
 func getProviderBaseURL(name string) string {
 	switch name {
 	case "minimax":

internal/tui/app.go

@@ -207,11 +207,11 @@ type keyMap struct {
 var keys = keyMap{
 	Tab: key.NewBinding(
 		key.WithKeys("tab"),
-		key.WithHelp("tab", "next tab"),
+		key.WithHelp("tab", "indent"),
 	),
 	Prev: key.NewBinding(
 		key.WithKeys("shift+tab"),
-		key.WithHelp("shift+tab", "prev tab"),
+		key.WithHelp("shift+tab", "unindent"),
 	),
 	Quit: key.NewBinding(
 		key.WithKeys("ctrl+c"),
@@ -490,14 +490,6 @@ func (m Model) handleKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 		m.tabMenuCursor = int(m.activeTab)
 		m.viewport.SetContent(m.renderContent())
 		return m, nil
-	case "tab":
-		m.activeTab = (m.activeTab + 1) % tabCount
-		m.resizeViewport()
-		return m, nil
-	case "shift+tab":
-		m.activeTab = (m.activeTab - 1 + tabCount) % tabCount
-		m.resizeViewport()
-		return m, nil
 	case "enter":
 		if (m.activeTab == tabChat || m.activeTab == tabWorkflow) && m.chatInput != "" && !m.chatLoading {
 			return m.handleChatSubmit()
@@ -597,13 +589,10 @@ func (m Model) handleTerminalKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 		}
 		return m, nil
 	case "tab":
-		m.activeTab = (m.activeTab + 1) % tabCount
-		m.resizeViewport()
-		return m, nil
-	case "shift+tab":
-		m.activeTab = (m.activeTab - 1 + tabCount) % tabCount
-		m.resizeViewport()
-		return m, nil
+		if m.activeTab == tabChat || m.activeTab == tabWorkflow {
+			m.chatInput += "\t"
+			m.viewport.SetContent(m.renderContent())
+		}
 	default:
 		if len(msg.String()) == 1 {
 			m.termInput += msg.String()
@@ -1685,13 +1674,13 @@ func (m Model) renderFooter() string {
 	case tabDashboard:
 		helpText = "[i] install  [u] update  [s] scan"
 	case tabChat, tabWorkflow:
-		helpText = "[ctrl+t] tabs  [tab] next  [ctrl+c] quit"
+		helpText = "[ctrl+t] switch tab  [ctrl+c] quit"
 	case tabTerminal:
 		helpText = "[enter] run  [ctrl+c] kill  [clear] clear"
 	case tabAgents:
 		helpText = "[c] crush  [l] claude"
 	default:
-		helpText = "[ctrl+t] tabs  [tab] next  [ctrl+c] quit"
+		helpText = "[ctrl+t] switch tab  [ctrl+c] quit"
 	}
 	rightR := statusBarStyle.Render(helpText)