Add frontend cache reset on consecutive pull-to-refresh within 10 seconds (#4235)

## Summary

Enables resetting the frontend cache via a double pull-to-refresh
gesture (within 10 seconds) in WebViewController, providing a
discoverable alternative to navigating through debug settings.

**Implementation:**
- Tracks pull-to-refresh timestamps to detect consecutive gestures
within 10-second window
- Triggers `cleanCache()` on second pull, provides haptic feedback
- Subsequent pulls within window continue resetting cache
- Pulls after 10+ seconds treated as new first pull

**Technical Details:**
- Added `lastPullToRefreshTimestamp` property to `WebViewController`
- Enhanced `pullToRefresh(_:)` method with time-window detection logic
- Uses existing `Current.websiteDataStoreHandler.cleanCache()`
infrastructure
- Comprehensive test coverage with mock `WebsiteDataStoreHandler`

```swift
@objc func pullToRefresh(_ sender: UIRefreshControl) {
    let now = Current.date()
    
    if let lastTimestamp = lastPullToRefreshTimestamp,
       now.timeIntervalSince(lastTimestamp) < 10 {
        // Cache reset path
        Current.websiteDataStoreHandler.cleanCache { [weak self] in
            self?.refresh()
            self?.updateSensors()
        }
        lastPullToRefreshTimestamp = now
    } else {
        // Normal refresh path
        lastPullToRefreshTimestamp = now
        refresh()
        updateSensors()
    }
}
```

## Screenshots
N/A - Internal behavior change with haptic feedback only

## Link to pull request in Documentation repository
Documentation: home-assistant/companion.home-assistant#

## Any other notes
Minimal change (+33 lines in WebViewController), leverages existing
cache clearing mechanism, testable via `Current.date()` abstraction.

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<!-- START COPILOT ORIGINAL PROMPT -->



<details>

<summary>Original prompt</summary>

> Reset frontend cache (DebugView) when user pull to refresh more than
once in WebViewController under 10 seconds


</details>



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Author: Copilot

Sources/App/WebView/WebViewController.swift

@@ -46,6 +46,9 @@ final class WebViewController: UIViewController, WKNavigationDelegate, WKUIDeleg
 
     private var loadActiveURLIfNeededInProgress = false
 
+    /// Track the timestamp of the last pull-to-refresh action
+    private var lastPullToRefreshTimestamp: Date?
+
     /// Handler for messages sent from the webview to the app
     var webViewExternalMessageHandler: WebViewExternalMessageHandlerProtocol = WebViewExternalMessageHandler(
         improvManager: ImprovManager.shared
@@ -865,6 +868,32 @@ final class WebViewController: UIViewController, WKNavigationDelegate, WKUIDeleg
     }
 
     @objc func pullToRefresh(_ sender: UIRefreshControl) {
+        let now = Current.date()
+
+        // Check if this is a consecutive pull-to-refresh within 10 seconds
+        if let lastTimestamp = lastPullToRefreshTimestamp,
+           now.timeIntervalSince(lastTimestamp) < 10 {
+            // Second pull-to-refresh within 10 seconds - reset frontend cache
+            Current.Log.info("Consecutive pull-to-refresh detected within 10 seconds, resetting frontend cache")
+            Current.impactFeedback.impactOccurred(style: .medium)
+
+            // Reset the cache
+            Current.websiteDataStoreHandler.cleanCache { [weak self] in
+                Current.Log.info("Frontend cache reset after consecutive pull-to-refresh")
+                self?.pullToRefreshActions()
+            }
+
+            // Set the timestamp to now after cache reset to ensure proper timing for next pull
+            // This prevents immediate re-triggering while still tracking for future pulls
+            lastPullToRefreshTimestamp = now
+        } else {
+            // First pull-to-refresh or outside the 10-second window
+            lastPullToRefreshTimestamp = now
+            pullToRefreshActions()
+        }
+    }
+
+    private func pullToRefreshActions() {
         refresh()
         updateSensors()
     }