feat: manual scan-now buttons + automation status line

Pairs with 4.6.10 (auto-VOD) and 4.6.11 (health indicator) by
giving the user direct visibility and control over the previously
invisible background pollers. Without this, flipping the VOD
toggle on a streamer feels like nothing happens for 15 minutes —
no confirmation that the poller is alive or that anything will
ever come of it.

Both run* functions now return the count they handled. Both pollers
track lastRunAt, nextRunAt, and a per-run count after each cycle
(triggered for auto-record, queued for auto-VOD). Three new IPC
handlers expose this:

- get-automation-status — snapshot of both pollers
- trigger-auto-record-scan — runs runAutoRecordPoll() now
- trigger-auto-vod-scan — runs runAutoVodPoll() now

Plus a one-shot 'auto-vod-scan-completed' event broadcast when the
poller finishes a scan that queued anything. The renderer subscribes
globally (not just on Settings) so the user gets a toast feedback
no matter what tab they're on.

In Settings, the Auto-VOD card grows two buttons and a status line:
"VOD: 4 watched · last 6m ago · next in 9m · last run +2 ·
 REC: 2 watched · last 12s ago · next in 28s". Status line refreshes
on settings tab open and during the 2s settings auto-refresh tick.
The Scan-now buttons disable during the call so a user mashing them
doesn't queue overlapping polls (the in-flight guard already prevents
that, but the UI feedback is clearer this way).

Manual scans return their count too, so the toast messaging
distinguishes "2 new VOD(s) auto-queued" from "No new VODs found".
Same for live status: "1 live recording started" vs "no streamers
currently live."

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/index.html

@@ -702,6 +702,11 @@
                             <span id="autoVodMaxAgeHoursLabel" style="font-size:12px; color:var(--text-secondary); margin-left:12px;">Max. Alter (Stunden)</span>
                             <input type="number" id="autoVodMaxAgeHours" min="1" max="720" value="24" style="width:90px;">
                         </div>
+                        <div class="form-row" style="align-items: center; gap: 12px; flex-wrap: wrap;">
+                            <button class="btn-secondary" id="btnAutoVodScanNow" onclick="triggerManualAutoVodScan()">Jetzt scannen</button>
+                            <button class="btn-secondary" id="btnAutoRecordScanNow" onclick="triggerManualAutoRecordScan()">Live-Status pruefen</button>
+                            <span id="autoVodStatusLine" style="font-size:12px; color: var(--text-secondary);"></span>
+                        </div>
                     </div>
 
                     <div class="settings-card">