General fixes (#76)

* Added print functionality to PDF viewer

* feat(pdf): add interactive button support and visibility reveal heuristic

* Moved search state management to MainViewModel and improved search UI interaction.

* Updated `pdfiumandroid` to version 2.0.0 and handled resulting API changes, including nullable page/text page returns and revised native pointer access.

increased compileSdk to 36.

* Fixed Table of Contents (TOC) truncation bug and improved the TOC UI in `PdfViewerScreen`.

- Implemented `getFixedTableOfContents` using reflection to bypass a library issue where sibling nodes were incorrectly truncated during traversal.
- Enhanced the TOC drawer with a nested, expandable tree structure using the new `PdfTocTreeItem` component.
- Added a custom `VerticalScrollbar` with draggable support for better navigation within long TOC lists.
- Integrated `animateColorAsState` and `animateFloatAsState` for smoother UI transitions in the TOC and scrollbar.
- Optimized TOC loading by flattening the tree structure and managing expansion states with `rememberSaveable`.

* Improved zoom pivot calculation and interaction handling in PdfVerticalReader

* Fixed high-res PDF tile bleeding by implementing clipRect in PdfBitmapLayer

* fix(pdf): resolve zoom stuttering, in pagination mode, by removing eager scale snapping

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

@@ -24,8 +24,15 @@ object NativePdfiumBridge {
     @JvmStatic external fun getPageObjectBoundingBox(pagePtr: Long, index: Int, outRect: FloatArray): Boolean
     @JvmStatic external fun extractImagePixels(pagePtr: Long, index: Int, dimens: IntArray): IntArray?
 
+    @JvmStatic external fun performClick(pagePtr: Long, x: Double, y: Double): Boolean
+
+    @JvmStatic external fun getAnnotSubtypeAtPoint(pagePtr: Long, x: Double, y: Double): Int
+    @JvmStatic external fun getAnnotRectAtPoint(pagePtr: Long, x: Double, y: Double): FloatArray?
+    @JvmStatic external fun checkActionSupport(): Boolean
+
     const val ANNOT_TEXT = 1         // Sticky Note
     const val ANNOT_LINK = 2         // Link
     const val ANNOT_HIGHLIGHT = 8    // Highlight
     const val ANNOT_INK = 12         // Freehand drawing
+    const val ANNOT_WIDGET = 19
 }