feat: sweep complet — tous les émojis → outline SVG icons

Templates modifiés (22 fichiers):
- _icons.html: +14 new icons (paperclip, external-link, sparkles, lightbulb, tag,
  file-text, save, upload, trending-up, zap, alert-triangle, user, eye-off)
- base.html: +8 JS icons, 🦎🐙🔑🔗👁📋🔲📑❓⚠️→SVG
- page_editor.html: 43→0 émojis (📎📄🔒🔗⭐📋📁✨📝🗄📑📊📅🗓🖼📥🌐✏💬💡 etc)
- settings.html: 30→0 (⚙️📋🏷🧩👥💾🙈👁🔒🌙☀️🌳📊📝⚠🦎✅🐙🔗✏🗑)
- local_workspace.html: 25→0 (📄📁✏🗑⚠📋➕)
- gitea_workspace.html: 25→0 (🔗📄📤🔄⚙📁📄🔒✏🗑💾)
- board.html: 13→0 (📁📊📋☰📈👥✕✓🗑⚡🔍)
- workspace.html: 11→0 (🏠🔑⚙📁🔗📂🐙)
- landing.html: 8→0 (📚🚀📝📊🦎🌐🔒⚡)
- trash.html, table_view, dashboard, accounts, card_detail, public_page,
  workspaces, team_load, notes, _header, detailed_board, card, board_fragment
- Ajouté import _icons.html aux fragments standalone
- 143 tests passent

app/templates/team_load.html

@@ -1,3 +1,4 @@
+{% from '_icons.html' import fd_icon %}
 <!-- Team Load — Notion-style stacked bar chart -->
 <div id="view-content" x-data="teamLoad()" class="team-load">
   {% for member in team_data %}
@@ -29,7 +30,7 @@
 
   {% if not team_data %}
   <div style="text-align:center; padding:48px; width:100%; color:var(--text-dim);">
-    <div style="font-size:48px; margin-bottom:16px;">👥</div>
+    <div style="margin-bottom:16px;">{{ fd_icon("users",48) }}</div>
     <h3>No team data</h3>
     <p style="margin-top:8px;">Assign issues to team members to see their workload.</p>
   </div>