Auto scroll update (#7)

* updated auto-scroll logic for EPUB and PDF

* Refactored auto-scroll to use temporary debounced pauses instead of hard stops on manual interaction.
* Updated tap handling to allow toggling bars without interrupting scroll.
* Added a 2-second orientation pause on EPUB chapter transitions.
* Enhanced AutoScrollControls UI with circular progress overlay to indicate the "temporarily paused" state.

* Refactored auto-scroll controls

This commit refactors the auto-scroll controls for both EPUB and PDF readers, introducing a more advanced and user-friendly interface.

Key changes:
- Redesigned the auto-scroll controls UI into a collapsible and lockable card.
- Added a "lock" feature to hide controls during scrolling.
- Introduced an alternative slider-based input for speed adjustment, which can be toggled.
- Persisted the lock and input mode states in SharedPreferences.
- Improved the EPUB auto-scroll mechanism using `translate3d` for smoother sub-pixel scrolling.

app/src/main/java/com/aryan/reader/pdf/PdfVerticalReader.kt

@@ -213,6 +213,7 @@ internal fun PdfVerticalReader(
     topContentPaddingPx: Float = 0f,
     onTextBoxMoved: (String, Int, Rect) -> Unit = { _, _, _ -> },
     isAutoScrollPlaying: Boolean = false,
+    isAutoScrollTempPaused: Boolean = false,
     autoScrollSpeed: Float = 1.0f,
     onInteractionListener: () -> Unit = {}
 ) {
@@ -484,9 +485,9 @@ internal fun PdfVerticalReader(
             }
         }
 
-        LaunchedEffect(isAutoScrollPlaying, autoScrollSpeed, totalDocHeight, screenHeight) {
-            if (isAutoScrollPlaying) {
-                val baseSpeedPxPerSec = 30f
+        LaunchedEffect(isAutoScrollPlaying, isAutoScrollTempPaused, autoScrollSpeed, totalDocHeight, screenHeight) {
+            if (isAutoScrollPlaying && !isAutoScrollTempPaused) {
+                val baseSpeedPxPerSec = 80f
                 var lastFrameTime = withFrameNanos { it }
 
                 while (isActive) {