feat(client/windows): make the console UI findable, and launchable on its own

Two problems, one feature. The gamepad/couch UI existed but you had to
already know it was there:

- On the hosts page its card only rendered when a controller was CONNECTED,
  so with no pad plugged in there was no visible entry point at all -- the
  only other door being a per-host overflow menu behind a "..." nobody
  opens. The card now always shows, with copy that adapts to whether a pad
  is present, so the feature is findable before you own the hardware.
- There was no way to start it directly. An HTPC or TV box wants the couch
  interface as its first screen, not the desktop shell. "punktfunk-client
  --console" now hands straight off to it (fullscreen unless --windowed),
  which covers shortcuts, Steam entries, autostart and Task Scheduler.

The Start-menu tile needs its own executable: an MSIX <Application> cannot
pass arguments to a full-trust exe, so "punktfunk-client.exe --console" is
not expressible there. punktfunk-console.exe is a ~20-line hand-off to the
session binary's browse mode, staged into the package and given its own
tile ("Punktfunk Console").

Nothing new is implemented behind either door: a bare "--browse" was
already a complete standalone client (host list, discovery, PIN pairing,
settings, Wake-on-LAN, library). It just had no front door.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitea/workflows/windows-msix.yml

@@ -104,8 +104,9 @@ jobs:
           "MSIX_VERSION=$v" | Out-File -FilePath $env:GITHUB_ENV -Append -Encoding utf8
           Write-Output "MSIX version $v  arch ${{ matrix.arch }}  target ${{ matrix.target }}"
 
-      # Both client binaries — the shell spawns punktfunk-session.exe (a package sibling)
-      # for every stream. --no-default-features on ARM64 is a no-op for the shell.
+      # All three client binaries — the shell spawns punktfunk-session.exe (a package
+      # sibling) for every stream, and punktfunk-console.exe is the couch Start-menu tile's
+      # hand-off shim. --no-default-features on ARM64 is a no-op for the shell.
       - name: Build (release)
         shell: pwsh
         run: cargo build --release -p punktfunk-client-windows -p punktfunk-client-session ${{ matrix.session_flags }} --target ${{ matrix.target }}