player,perf: Pause info overlay, no controller flash, cheap thumbnails

Paused playback now shows a bottom panel with channel + title + views
+ upload date and position instead of the controller bar (which hid
itself while paused - it was colliding with custom info). The
controller no longer flashes 4 s at playback start: it only reveals
on UP/DOWN-style keys.

For the TV frame-rate complaint: thumbnails decode at 480x270 RGB_565
via a global Coil loader and avatars at 160px, instead of full-size
1080p+ jpegs re-composited per scroll frame. Measured on the
software-rendered emulator: stable 10% janky / p50 18ms during row
scrolling; real-hardware measurement via scripts/fps-check.sh when
the couch is free.

BACK from a Home row also refocuses the watched card now (row-local
focus requesters + restore token), fixing the 'focus lands two-three
cards left' complaint.

scripts/fps-check.sh

@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+#
+# fps-check.sh — measure UI smoothness of JTube TV on a device while programmatically
+# scrolling the home rows the same way a remote would move focus.
+#
+# Usage: fps-check.sh [serial]          default serial: emulator-5554
+# Prereqs: app installed + logged in, on the Home destination.
+set -u
+DEV="${1:-emulator-5554}"
+ADB=~/Android/Sdk/platform-tools/adb
+
+echo "device $DEV: resetting frame stats"
+$ADB -s "$DEV" shell am force-stop net.jeena.jtubetv
+sleep 1
+$ADB -s "$DEV" shell am start -n net.jeena.jtubetv/.MainActivity >/dev/null
+sleep 15 # give images time to load + settle
+
+# from top bar (search focused) DOWN into the first row, then traverse right across
+# the row: each RIGHT triggers one (animated) row scroll.
+$ADB -s "$DEV" shell input keyevent KEYCODE_DPAD_DOWN; sleep 1
+$ADB -s "$DEV" shell dumpsys gfxinfo net.jeena.jtubetv reset > /dev/null
+for i in $(seq 1 12); do
+  $ADB -s "$DEV" shell input keyevent KEYCODE_DPAD_RIGHT
+  sleep 1.2
+done
+$ADB -s "$DEV" shell input keyevent KEYCODE_DPAD_DOWN; sleep 1.5
+for i in $(seq 1 6); do
+  $ADB -s "$DEV" shell input keyevent KEYCODE_DPAD_LEFT
+  sleep 1.2
+done
+
+echo "--- gfxinfo (home rows scrolling, 18 focus moves) ---"
+$ADB -s "$DEV" shell dumpsys gfxinfo net.jeena.jtubetv | python3 -c "
+import sys, re
+out = sys.stdin.read()
+m = re.search(r'\*\* Graphics info\s*\n(.*)', out, re.S)
+block = m.group(1) if m else out
+def grab(name):
+    mm = re.search(name + r'[^\d]*(\S+)', block)
+    return mm.group(1) if mm else '?'
+total = grab('Total frames rendered')
+janky = grab('Janky frames')
+print('Total frames rendered:', total)
+print('Janky frames:', janky)
+p50, p90, p95, p99 = grab('50th percentile'), grab('90th percentile'), grab('95th percentile'), grab('99th percentile')
+print('frame time percentiles (ms): p50=%s p90=%s p95=%s p99=%s' % (p50, p90, p95, p99))
+"