feat(pilot): mount ChatTabStrip + ScriptBuilderTab + InlineNoTemplateDialog

Wires the three new components into AssistantChatPage:
- ChatTabStrip renders when the active fix needs a script drafted.
- ScriptBuilderTab sits alongside chat via display:none toggling so
  chat scroll position + builder state both persist.
- InlineNoTemplateDialog replaces the task-lane bottomSlot render for
  the drafted-script evaluation case; three cards finally fit.
- Banner Apply routing updated: no-draft/no-template → Script Builder
  tab; drafted → InlineNoTemplateDialog; template → unchanged path.

applyFix() call site moves land in the next task.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/pages/AssistantChatPage.tsx

@@ -20,8 +20,10 @@ import type { BannerMode } from '@/components/pilot/ProposalBanner'
 import { EscalateInterceptDialog } from '@/components/pilot/EscalateInterceptDialog'
 import type { InterceptChoice } from '@/components/pilot/EscalateInterceptDialog'
 import { TemplateMatchPanel } from '@/components/pilot/script/TemplateMatchPanel'
-import { NoTemplateDialog } from '@/components/pilot/script/NoTemplateDialog'
 import { TemplatizePrompt } from '@/components/pilot/script/TemplatizePrompt'
+import { ChatTabStrip, type ChatTab } from '@/components/pilot/ChatTabStrip'
+import { ScriptBuilderTab } from '@/components/pilot/ScriptBuilderTab'
+import { InlineNoTemplateDialog } from '@/components/pilot/InlineNoTemplateDialog'
 import { ShortcutsHelpOverlay } from '@/components/pilot/ShortcutsHelpOverlay'
 import { useKeyboardShortcuts } from '@/hooks/useKeyboardShortcuts'
 import { useMediaQuery } from '@/hooks/useMediaQuery'
@@ -138,6 +140,9 @@ export default function AssistantChatPage() {
   const [postApplyMsgCount, setPostApplyMsgCount] = useState(0)
   const [nudgeSilenced, setNudgeSilenced] = useState(false)
   const [escalateIntercept, setEscalateIntercept] = useState<{ fixId: string; fixTitle: string } | null>(null)
+  // Phase 9: ChatTabStrip + ScriptBuilderTab state.
+  const [chatTab, setChatTab] = useState<ChatTab>('chat')
+  const [scriptBuilderHasProgress, setScriptBuilderHasProgress] = useState(false)
   // Phase 8: compute the current banner mode from activeFix.
   // applied_at is now persisted on the server (stamped by POST /apply),
   // so bannerMode is derived entirely from server state — no client-side flag.
@@ -154,6 +159,22 @@ export default function AssistantChatPage() {
     return 'proposed'
   })()
 
+  // Phase 9: show the tab strip when the fix needs a script drafted (no template,
+  // no drafted script yet, and still in a live state).
+  const showTabStrip =
+    activeFix != null
+    && activeFix.status !== 'dismissed'
+    && activeFix.status !== 'applied_success'
+    && activeFix.status !== 'applied_failed'
+    && !activeFix.script_template_id
+    && !activeFix.ai_drafted_script
+
+  // Defensive: if the strip hides (fix resolved/dismissed/script-drafted),
+  // snap back to the Chat tab so the user doesn't land on a blank panel.
+  useEffect(() => {
+    if (!showTabStrip && chatTab === 'script_builder') setChatTab('chat')
+  }, [showTabStrip, chatTab])
+
   const toggleSidebarCollapse = () => {
     const next = !sidebarCollapsed
     setSidebarCollapsed(next)
@@ -343,6 +364,9 @@ export default function AssistantChatPage() {
     setPostApplyMsgCount(0)
     setNudgeSilenced(false)
     setEscalateIntercept(null)
+    // Phase 9: tab strip reset
+    setChatTab('chat')
+    setScriptBuilderHasProgress(false)
   }, [])
 
   // Phase 2 facts — fetch + handlers. `refreshFacts` is called from selectChat
@@ -511,23 +535,22 @@ export default function AssistantChatPage() {
     refreshPreview(activeChatId, kind)
   }, [activeChatId, previewKind, refreshPreview])
 
-  // Phase 8: handleApplyFix — stamps applied_at on the server so Verifying state
-  // survives refresh/reselect/multi-tab, then opens the script panel.
-  const handleApplyFix = useCallback(async () => {
-    if (!activeFix || !activeChatId) return
-    setPostApplyMsgCount(0)
-    setNudgeSilenced(false)
-    try {
-      const updated = await sessionSuggestedFixesApi.applyFix(activeChatId, activeFix.id)
-      setActiveFix(updated)
-    } catch (err: unknown) {
-      // Non-fatal: the script panel still opens. The banner will stay in
-      // 'proposed' mode until the next refreshActiveFix succeeds, which is
-      // a cosmetic gap only — no data loss.
-      console.error('[AssistantChat] applyFix failed:', err)
+  // Phase 9: handleApplyFix — routes to the appropriate surface based on
+  // fix state. applyFix() call site moves to Task 13 (handleScriptDecision
+  // and TemplateMatchPanel.onMarkRun).
+  const handleApplyFix = useCallback(() => {
+    if (!activeFix) return
+    if (activeFix.script_template_id) {
+      setScriptPanelOpen(true) // existing TemplateMatchPanel flow in task lane
+      return
     }
-    setScriptPanelOpen(true)
-  }, [activeFix, activeChatId])
+    if (activeFix.ai_drafted_script) {
+      setScriptPanelOpen(true) // InlineNoTemplateDialog, now in chat region (Step 5)
+      return
+    }
+    // No draft, no template — route to the Script Builder tab.
+    setChatTab('script_builder')
+  }, [activeFix])
 
   // Phase 8: record a terminal outcome for the active fix. Updates local state
   // on success. For applied_success also opens the Resolve preview.
@@ -1372,6 +1395,19 @@ export default function AssistantChatPage() {
               )
             })()}
 
+            {/* Phase 9: ChatTabStrip — shown when the fix needs a script drafted */}
+            {showTabStrip && (
+              <ChatTabStrip
+                active={chatTab}
+                onChange={setChatTab}
+                scriptBuilderHasProgress={scriptBuilderHasProgress}
+              />
+            )}
+
+            {/* Chat tab content — messages + banner + composer.
+                Hidden (not unmounted) when Script Builder tab is active so
+                scroll position and input state are preserved. */}
+            <div className={cn('flex-1 min-h-0 flex flex-col', chatTab !== 'chat' && 'hidden')}>
             {/* Messages */}
             <div className="flex-1 overflow-y-auto px-4 sm:px-6 py-4 space-y-4">
               {messages.length === 0 && !loading && (
@@ -1426,6 +1462,18 @@ export default function AssistantChatPage() {
               />
             )}
 
+            {/* Phase 9: InlineNoTemplateDialog — drafted-script evaluation case,
+                rendered in the chat region above the composer so all three
+                option cards fit side-by-side without the TaskLane's narrow width. */}
+            {scriptPanelOpen && activeFix && activeChatId && !activeFix.script_template_id && activeFix.ai_drafted_script && (
+              <InlineNoTemplateDialog
+                fix={activeFix}
+                onClose={() => setScriptPanelOpen(false)}
+                onDecide={handleScriptDecision}
+                busy={scriptDecisionBusy}
+              />
+            )}
+
             {/* Rich Input */}
             <div className="px-3 sm:px-6 py-3 shrink-0">
               <div
@@ -1550,6 +1598,24 @@ export default function AssistantChatPage() {
                 </div>
               </div>
             </div>
+            </div>{/* end chat-tab content wrapper */}
+
+            {/* Phase 9: Script Builder tab — mounted alongside chat via display:none
+                so both scroll positions and state are preserved across tab switches. */}
+            {showTabStrip && activeFix && activeChatId && (
+              <div className={cn('flex-1 min-h-0 flex flex-col', chatTab !== 'script_builder' && 'hidden')}>
+                <ScriptBuilderTab
+                  fix={activeFix}
+                  pilotSessionId={activeChatId}
+                  onProgressChange={setScriptBuilderHasProgress}
+                  onScriptDrafted={(updated) => {
+                    setActiveFix(updated)
+                    setChatTab('chat')
+                    setScriptBuilderHasProgress(false)
+                  }}
+                />
+              </div>
+            )}
           </>
         ) : (
           <div className="flex flex-col items-center justify-center h-full text-center">
@@ -1626,21 +1692,12 @@ export default function AssistantChatPage() {
                 }
                 bottomSlot={
                   <>
-                    {scriptPanelOpen && activeFix && activeChatId && (
-                      activeFix.script_template_id ? (
-                        <TemplateMatchPanel
-                          fix={activeFix}
-                          sessionId={activeChatId}
-                          onClose={() => setScriptPanelOpen(false)}
-                        />
-                      ) : (
-                        <NoTemplateDialog
-                          fix={activeFix}
-                          onClose={() => setScriptPanelOpen(false)}
-                          onDecide={handleScriptDecision}
-                          busy={scriptDecisionBusy}
-                        />
-                      )
+                    {scriptPanelOpen && activeFix && activeChatId && activeFix.script_template_id && (
+                      <TemplateMatchPanel
+                        fix={activeFix}
+                        sessionId={activeChatId}
+                        onClose={() => setScriptPanelOpen(false)}
+                      />
                     )}
                     <div className="flex items-center gap-3 px-3 mt-1">
                       <button
@@ -1705,21 +1762,12 @@ export default function AssistantChatPage() {
           }
           bottomSlot={
             <>
-              {scriptPanelOpen && activeFix && activeChatId && (
-                activeFix.script_template_id ? (
-                  <TemplateMatchPanel
-                    fix={activeFix}
-                    sessionId={activeChatId}
-                    onClose={() => setScriptPanelOpen(false)}
-                  />
-                ) : (
-                  <NoTemplateDialog
-                    fix={activeFix}
-                    onClose={() => setScriptPanelOpen(false)}
-                    onDecide={handleScriptDecision}
-                    busy={scriptDecisionBusy}
-                  />
-                )
+              {scriptPanelOpen && activeFix && activeChatId && activeFix.script_template_id && (
+                <TemplateMatchPanel
+                  fix={activeFix}
+                  sessionId={activeChatId}
+                  onClose={() => setScriptPanelOpen(false)}
+                />
               )}
               <div className="flex items-center gap-3 px-3 mt-1">
                 <button