Restyle UI with a channel-strip console look and brand icon

Adds a pink/purple/blue SVG brand mark (favicon + header) and reworks
the visual language around the app's actual interaction - fader-driven
device control - via LED-style indicators, mono instrument readouts,
hairline-framed cards, console-tab nav, and an oscilloscope-style
session timeline. Leaves components/ui/* untouched, restyling only via
design tokens and the app's own composed components. Also fixes a
proxy.ts matcher gap that was gating /icon.svg behind auth.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01W8WkFF5ppURBAB918593Eb

components/stats/DeviceUsageTable.tsx

@@ -30,10 +30,10 @@ export function DeviceUsageTable({ devices }: { devices: DeviceUsageRow[] }) {
         {devices.map((d) => (
           <TableRow key={d.deviceId}>
             <TableCell className="font-medium">{d.displayName ?? d.bleName}</TableCell>
-            <TableCell>{d.sessionCount}</TableCell>
-            <TableCell>{(d.totalActiveMs / 60_000).toFixed(1)}m</TableCell>
-            <TableCell>{d.commandCount}</TableCell>
-            <TableCell className="text-muted-foreground">
+            <TableCell className="bp-readout">{d.sessionCount}</TableCell>
+            <TableCell className="bp-readout">{(d.totalActiveMs / 60_000).toFixed(1)}m</TableCell>
+            <TableCell className="bp-readout">{d.commandCount}</TableCell>
+            <TableCell className="bp-readout text-muted-foreground">
               {d.lastUsedAt ? new Date(d.lastUsedAt).toLocaleString() : "Never"}
             </TableCell>
           </TableRow>