fix(ui,install): Models page couldn't scroll to installed models; report install result in original window

Models.jsx clipped the whole card with overflow:hidden while only the
"Available Models" section (never visible when the hardware-recommended
list alone filled the card) had its own scroll — the installed-models
list was unreachable with no scrollbar. The whole card now scrolls as
one region instead.

install-windows.ps1's original (non-elevated) window printed "Requesting
administrator privileges..." and exited immediately, so all real
progress and the "installed!" banner only ever appeared in the separate
elevated window — making the original window look like it silently
quit. It now waits (-Wait -PassThru) and reports success/failure itself.

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

install-windows.ps1

@@ -82,8 +82,20 @@ $IsAdmin = ([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIden
     [Security.Principal.WindowsBuiltInRole]::Administrator)
 if (-not $IsAdmin) {
     Write-Host "Requesting administrator privileges..." -ForegroundColor Yellow
-    Start-Process powershell -ArgumentList "-NoProfile -ExecutionPolicy Bypass -File `"$PSCommandPath`" -OwnsWindow" -Verb RunAs
-    exit
+    # -Wait -PassThru so this window blocks until the elevated install finishes
+    # and can report success/failure itself - without it, this window just says
+    # "Requesting..." and exits immediately, while all real progress (and the
+    # "installed!" banner) happens in the separate elevated window, making the
+    # original window look like it silently quit.
+    $proc = Start-Process powershell -ArgumentList "-NoProfile -ExecutionPolicy Bypass -File `"$PSCommandPath`" -OwnsWindow" -Verb RunAs -Wait -PassThru
+    Write-Host ""
+    if ($proc.ExitCode -eq 0) {
+        Write-Host "  NexusOS installed successfully." -ForegroundColor Green
+        Write-Host "  Open a NEW terminal and run 'ncp help', or double-click the NexusOS desktop shortcut." -ForegroundColor White
+    } else {
+        Write-Host "  Install did not finish (exit code $($proc.ExitCode)). Check the elevated window for errors." -ForegroundColor Red
+    }
+    exit $proc.ExitCode
 }
 
 Write-Host ""

interface/web/src/Models.jsx

@@ -161,7 +161,8 @@ export function Models({ onPullStateChange }) {
         padding: "1rem",
         display: "flex",
         flexDirection: "column",
-        overflow: "hidden"
+        overflowY: "auto",
+        overflowX: "hidden"
       }}>
         {/* Pull Model Section */}
         <div style={{ marginBottom: "1.5rem", paddingBottom: "1rem", borderBottom: "1px solid #333" }}>
@@ -260,7 +261,7 @@ export function Models({ onPullStateChange }) {
         )}
 
         {/* Local Models List */}
-        <div style={{ flexGrow: 1, overflowY: "auto", paddingRight: "0.5rem" }}>
+        <div style={{ paddingRight: "0.5rem" }}>
           <h3 style={{ margin: "0 0 1rem 0", fontSize: "0.95rem", color: "#bbb" }}>
             Available Models ({models.length})
           </h3>