Add seed script with 7 trees, markdown rendering, and dark mode docs

- Add comprehensive seed script with 7 troubleshooting decision trees
  - Tier 1: Password Reset, Outlook/Email, VPN, Printer Problems
  - Tier 2: Slow Computer, Network Connectivity
  - Tier 3: File Share Access Problems
- Add markdown rendering with react-markdown package
  - MarkdownContent component for session player and node editor
  - Preview toggle in description fields
- Update documentation to reflect dark mode is complete
- Update all progress tracking docs with recent changes

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/components/tree-editor/NodeFormResolution.tsx

@@ -1,5 +1,7 @@
+import { useState } from 'react'
 import { DynamicArrayField } from './DynamicArrayField'
 import { useTreeEditorStore } from '@/store/treeEditorStore'
+import { MarkdownContent } from '@/components/ui/MarkdownContent'
 import type { TreeStructure } from '@/types'
 import { cn } from '@/lib/utils'
 
@@ -10,6 +12,7 @@ interface NodeFormResolutionProps {
 
 export function NodeFormResolution({ node, onUpdate }: NodeFormResolutionProps) {
   const { validationErrors } = useTreeEditorStore()
+  const [showPreview, setShowPreview] = useState(false)
 
   const titleError = validationErrors.find(
     e => e.nodeId === node.id && e.field === 'title'
@@ -66,20 +69,45 @@ export function NodeFormResolution({ node, onUpdate }: NodeFormResolutionProps)
 
       {/* Description */}
       <div>
-        <label className="block text-sm font-medium text-foreground">
-          Description
-        </label>
-        <textarea
-          value={node.description || ''}
-          onChange={(e) => onUpdate({ description: e.target.value })}
-          placeholder="Summary of the resolution and any follow-up recommendations..."
-          rows={3}
-          className={cn(
-            'mt-1 block w-full rounded-md border border-input px-3 py-2 text-sm',
-            'bg-background text-foreground placeholder:text-muted-foreground',
-            'focus:border-primary focus:outline-none focus:ring-1 focus:ring-primary'
+        <div className="flex items-center justify-between">
+          <label className="block text-sm font-medium text-foreground">
+            Description
+          </label>
+          {node.description && (
+            <button
+              type="button"
+              onClick={() => setShowPreview(!showPreview)}
+              className="text-xs text-primary hover:underline"
+            >
+              {showPreview ? 'Edit' : 'Preview'}
+            </button>
           )}
-        />
+        </div>
+        <p className="mb-1 text-xs text-muted-foreground">
+          Supports markdown: **bold**, *italic*, - lists, 1. numbered lists, `code`
+        </p>
+        {showPreview && node.description ? (
+          <div className="mt-1 rounded-md border border-input bg-muted/50 p-3 text-sm">
+            <MarkdownContent content={node.description} />
+          </div>
+        ) : (
+          <textarea
+            value={node.description || ''}
+            onChange={(e) => onUpdate({ description: e.target.value })}
+            placeholder="Summary of the resolution and any follow-up recommendations...
+
+**Ticket Notes:**
+Document what was done and the outcome.
+
+**Close ticket as:** Resolved"
+            rows={5}
+            className={cn(
+              'mt-1 block w-full rounded-md border border-input px-3 py-2 text-sm',
+              'bg-background text-foreground placeholder:text-muted-foreground',
+              'focus:border-primary focus:outline-none focus:ring-1 focus:ring-primary'
+            )}
+          />
+        )}
       </div>
 
       {/* Resolution Steps */}