fix: hide system properties (trashed, archived, icon) from Properties panel

These properties have dedicated UI elsewhere (trash/archive banner, emoji picker)
and should not appear as generic editable properties.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/DynamicPropertiesPanel.test.tsx

@@ -227,14 +227,14 @@ describe('DynamicPropertiesPanel', () => {
       <DynamicPropertiesPanel
         entry={makeEntry()}
         content=""
-        frontmatter={{ archived: false }}
+        frontmatter={{ published: false }}
         onUpdateProperty={onUpdateProperty}
       />
     )
     // Boolean should show as Yes/No toggle
     const toggleBtn = screen.getByText('\u2717 No')
     fireEvent.click(toggleBtn)
-    expect(onUpdateProperty).toHaveBeenCalledWith('archived', true)
+    expect(onUpdateProperty).toHaveBeenCalledWith('published', true)
   })
 
   it('renders array property as tag pills', () => {
@@ -441,7 +441,7 @@ describe('DynamicPropertiesPanel', () => {
       <DynamicPropertiesPanel
         entry={makeEntry()}
         content=""
-        frontmatter={{ archived: 'false' }}
+        frontmatter={{ draft: 'false' }}
         onUpdateProperty={onUpdateProperty}
       />
     )
@@ -450,7 +450,7 @@ describe('DynamicPropertiesPanel', () => {
     const input = screen.getByDisplayValue('false')
     fireEvent.change(input, { target: { value: 'true' } })
     fireEvent.keyDown(input, { key: 'Enter' })
-    expect(onUpdateProperty).toHaveBeenCalledWith('archived', true)
+    expect(onUpdateProperty).toHaveBeenCalledWith('draft', true)
   })
 
   it('coerces numeric strings to numbers on save', () => {
@@ -885,7 +885,7 @@ describe('DynamicPropertiesPanel', () => {
         <DynamicPropertiesPanel
           entry={makeEntry()}
           content=""
-          frontmatter={{ archived: false }}
+          frontmatter={{ published: false }}
           onUpdateProperty={onUpdateProperty}
         />
       )
@@ -894,6 +894,54 @@ describe('DynamicPropertiesPanel', () => {
     })
   })
 
+  describe('system property filtering', () => {
+    it('hides trashed, trashed_at, archived, archived_at, icon from properties panel', () => {
+      render(
+        <DynamicPropertiesPanel
+          entry={makeEntry()}
+          content=""
+          frontmatter={{ trashed: true, trashed_at: '2026-01-01', archived: false, archived_at: '', icon: '📝', cadence: 'Weekly' }}
+          onUpdateProperty={onUpdateProperty}
+        />
+      )
+      expect(screen.queryByText('trashed')).not.toBeInTheDocument()
+      expect(screen.queryByText('trashed_at')).not.toBeInTheDocument()
+      expect(screen.queryByText('archived')).not.toBeInTheDocument()
+      expect(screen.queryByText('archived_at')).not.toBeInTheDocument()
+      expect(screen.queryByText('icon')).not.toBeInTheDocument()
+      // Custom property still visible
+      expect(screen.getByText('cadence')).toBeInTheDocument()
+    })
+
+    it('filters system properties case-insensitively', () => {
+      render(
+        <DynamicPropertiesPanel
+          entry={makeEntry()}
+          content=""
+          frontmatter={{ Trashed: true, Archived: false, Icon: '🎯', cadence: 'Daily' }}
+          onUpdateProperty={onUpdateProperty}
+        />
+      )
+      expect(screen.queryByText('Trashed')).not.toBeInTheDocument()
+      expect(screen.queryByText('Archived')).not.toBeInTheDocument()
+      expect(screen.queryByText('Icon')).not.toBeInTheDocument()
+      expect(screen.getByText('cadence')).toBeInTheDocument()
+    })
+
+    it('does not filter similar but non-matching property names', () => {
+      render(
+        <DynamicPropertiesPanel
+          entry={makeEntry()}
+          content=""
+          frontmatter={{ 'Is Trashed': true, 'archive_date': '2026-01-01' }}
+          onUpdateProperty={onUpdateProperty}
+        />
+      )
+      expect(screen.getByText('Is Trashed')).toBeInTheDocument()
+      expect(screen.getByText('archive_date')).toBeInTheDocument()
+    })
+  })
+
   describe('display mode override', () => {
     beforeEach(() => {
       resetVaultConfigStore()

src/hooks/usePropertyPanelState.ts

@@ -11,7 +11,8 @@ import {
 import { containsWikilinks } from '../components/DynamicPropertiesPanel'
 
 // Keys to skip showing in Properties (handled by dedicated UI or internal)
-const SKIP_KEYS = new Set(['aliases', 'workspace', 'title', 'type', 'is_a', 'Is A'])
+// Compared case-insensitively via isVisibleProperty()
+const SKIP_KEYS = new Set(['aliases', 'workspace', 'title', 'type', 'is_a', 'is a', 'trashed', 'trashed_at', 'archived', 'archived_at', 'icon'])
 
 function coerceValue(raw: string): FrontmatterValue {
   if (raw.toLowerCase() === 'true') return true
@@ -79,7 +80,7 @@ function collectAllVaultTags(entries: VaultEntry[] | undefined): Record<string,
 }
 
 function isVisibleProperty([key, value]: [string, FrontmatterValue]): boolean {
-  return !SKIP_KEYS.has(key) && !containsWikilinks(value)
+  return !SKIP_KEYS.has(key.toLowerCase()) && !containsWikilinks(value)
 }
 
 function parseAddedValue(rawValue: string, mode: PropertyDisplayMode): FrontmatterValue {