fix: workspaces topbar 🔑⚙ → outline SVG key+settings

- _icons.html: +key icon (Lucide style)
- getSvgIcon JS: +key (matching SVG)
- workspaces.html: 🔑 Login → fd_icon('key'), ⚙ Settings → fd_icon('settings')
- 143 tests passent

app/templates/_icons.html

@@ -70,6 +70,8 @@
 <svg width="{{s}}" height="{{s}}" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="9" y="9" width="13" height="13" rx="2" ry="2"/><path d="M5 15H4a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2h9a2 2 0 0 1 2 2v1"/></svg>
 {%- elif name == 'chevron-down' -%}
 <svg width="{{s}}" height="{{s}}" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="6 9 12 15 18 9"/></svg>
+{%- elif name == 'key' -%}
+<svg width="{{s}}" height="{{s}}" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 2l-2 2m-7.61 7.61a5.5 5.5 0 1 1-7.778 7.778 5.5 5.5 0 0 1 7.777-7.777zm0 0L15.5 7.5m0 0l3 3L22 7l-3-3m-3.5 3.5L19 4"/></svg>
 {%- elif name == 'inbox' -%}
 <svg width="{{s}}" height="{{s}}" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><polyline points="22 12 16 12 14 15 10 15 8 12 2 12"/><path d="M5.45 5.11L2 12v6a2 2 0 0 0 2 2h16a2 2 0 0 0 2-2v-6l-3.45-6.89A2 2 0 0 0 16.76 4H7.24a2 2 0 0 0-1.79 1.11z"/></svg>
 {%- elif name == 'edit' -%}