feat: give window closing its own Pencereler tab

The window switch sat on the Upload Service page, which implied a relationship
that does not exist: closing windows needs no ABRP token, no GPS, no upload
interval, and runs in its own service whether or not uploading is on. It is now
a sixth page of the pager, between Araç and Wi-Fi.

Splitting it in two while it moved, because the new page has room the card did
not: the switch and status stay together, and the event log gets its own card,
monospaced and no longer capped at four lines.

setOffscreenPageLimit switches from a hardcoded 4 to panes.length - 1. It was
already one short of the page count and would have gone stale again here.
refreshWindowClose runs on the two-second tick and dereferences views on a page
that may not be on screen, so the pager must not be free to detach them.

Six tabs share the bar where five did. Widget.EV.NavTab already autosizes down
to a 12sp floor, so the labels shrink rather than truncate.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

app/src/main/res/drawable/ic_tab_windows.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- A car door with its glass, for the Windows page. Filled to match the other tab icons,
+     which read at a glance on a vehicle screen rather than rewarding a close look. -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M20,10.5l-1.6,-4.6C18.1,5.1 17.4,4.5 16.5,4.5H8.2C7.5,4.5 6.9,4.9 6.6,5.5L3.2,12.2C3.1,12.4 3,12.7 3,13v5c0,0.8 0.7,1.5 1.5,1.5h14c0.8,0 1.5,-0.7 1.5,-1.5v-7.5zM8.4,6.5h8.1l1.4,4H6.3l2.1,-4zM6,17c-0.8,0 -1.5,-0.7 -1.5,-1.5S5.2,14 6,14s1.5,0.7 1.5,1.5S6.8,17 6,17zM18,16.5h-8v-2h8v2z" />
+</vector>