Added Connect Mode toggle button on rack and device views. When active,
clicking a port selects it (glowing accent border), clicking a second
port opens a mini form to choose connection type/color/labels and
create the cable in one flow. Escape or re-clicking deselects. Port
elements now use onclick JS instead of HTMX triggers to support both
normal inspection mode and connect mode.
Port spans now pick up the connection's actual color for border and a
light tint for background via inline styles. The .connected CSS class
only ups the border width to 2px for emphasis. Applied to _port_list.html
shared partial and wall_sockets.html inline rendering.
Extracted shared _port_list.html partial with connected-port checking,
loaded into every page's template set. DeviceView and WallSocket handlers
now load connection data and pass it to the template. Removed duplicate
inline port_list definition from rack.html.
Joca