feat: add PSA ticket export format and Quick-Start landing page

PSA Export:
- New "PSA / Ticket Note" export format optimized for ConnectWise
- Structured output: Problem, Steps Taken, Resolution, Time Spent, Notes
- Prominent "Copy for Ticket" button on session detail page
- 24 unit tests for PSA export generator

Quick-Start Landing:
- New default landing page with search-first UX
- Auto-focused search bar with debounced tree search
- "Continue Session" cards for active sessions
- "Recent Trees" section from session history
- Home nav item and logo links updated

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/app/services/export_service.py

@@ -1,15 +1,31 @@
 """
 Session export generators for ResolutionFlow.
 
-Provides markdown, plain text, and HTML export formatters
+Provides markdown, plain text, HTML, and PSA/ticket note export formatters
 for troubleshooting sessions.
 """
 import html
+from datetime import datetime, timezone
 
 from app.models.session import Session
 from app.schemas.session import SessionExport
 
 
+def _format_duration(started_at: datetime, completed_at: datetime | None) -> str:
+    """Format duration between two datetimes as human-readable string."""
+    if not completed_at:
+        return "In progress"
+    delta = completed_at - started_at
+    total_seconds = int(delta.total_seconds())
+    if total_seconds < 0:
+        return "0 minutes"
+    hours, remainder = divmod(total_seconds, 3600)
+    minutes = remainder // 60
+    if hours > 0:
+        return f"{hours}h {minutes}m"
+    return f"{minutes} minutes"
+
+
 def generate_markdown_export(session: Session, options: SessionExport) -> str:
     """Generate markdown export."""
     lines = []
@@ -160,3 +176,65 @@ def generate_html_export(session: Session, options: SessionExport) -> str:
 
     html_parts.extend(['</body>', '</html>'])
     return "\n".join(html_parts)
+
+
+def generate_psa_export(session: Session, options: SessionExport) -> str:
+    """Generate PSA/ticket note export optimized for ConnectWise and similar PSA tools."""
+    lines = []
+
+    tree_name = session.tree_snapshot.get("name", "Troubleshooting Session")
+    tree_description = session.tree_snapshot.get("description", "")
+    ticket_number = session.ticket_number or "N/A"
+    client_name = session.client_name or "N/A"
+    date_str = session.started_at.strftime("%Y-%m-%d %H:%M")
+
+    lines.append("=== TROUBLESHOOTING NOTES ===")
+    lines.append(f"Ticket: {ticket_number}  |  Client: {client_name}")
+    lines.append(f"Tree: {tree_name}  |  Date: {date_str}")
+    lines.append("")
+
+    # Problem section
+    lines.append("--- PROBLEM ---")
+    lines.append(tree_description if tree_description else "No description provided.")
+    lines.append("")
+
+    # Steps taken
+    lines.append("--- STEPS TAKEN ---")
+    if session.decisions:
+        for i, decision in enumerate(session.decisions, 1):
+            question = decision.get("question") or decision.get("action_performed", "Step")
+            answer = decision.get("answer", "")
+            notes = decision.get("notes", "")
+
+            line = f"{i}. {question}"
+            if answer:
+                line += f" -> {answer}"
+            lines.append(line)
+            if notes:
+                lines.append(f"   Notes: {notes}")
+    else:
+        lines.append("No steps recorded.")
+    lines.append("")
+
+    # Resolution - last decision answer
+    lines.append("--- RESOLUTION ---")
+    if session.decisions:
+        last_decision = session.decisions[-1]
+        resolution = last_decision.get("answer") or last_decision.get("question", "No resolution recorded")
+        lines.append(resolution)
+    else:
+        lines.append("No resolution recorded.")
+    lines.append("")
+
+    # Time spent
+    lines.append("--- TIME SPENT ---")
+    duration = _format_duration(session.started_at, session.completed_at)
+    lines.append(f"Duration: {duration}")
+    lines.append("")
+
+    # Engineer notes (scratchpad)
+    lines.append("--- ENGINEER NOTES ---")
+    scratchpad = getattr(session, 'scratchpad', '') or ''
+    lines.append(scratchpad.strip() if scratchpad.strip() else "None")
+
+    return "\n".join(lines)