1022918: Updated the document handling files

[Priyadharshini-SF3813]

Updated document handling by migrating React-based PDF viewer logic to ASP.NET Core using Syncfusion EJ2 APIs. Added document load handling with zoom and page navigation for improved viewer reliability.

[SyncfusionBuild]

The running CI Job is terminated due to changes committed on the source branch for this Merge Request and CI triggered for latest commit.

[SyncfusionBuild]

CI Status: ABORTED ❌
Source Compilation: Not Started ❌
Build Location: 1022918-DocumentHandlingCore

[SyncfusionBuild]

Build Status: INQUEUE 🕒
Build Location: 1022918-DocumentHandlingCore

[SyncfusionBuild]

Build Status: INPROGRESS 🔃
Build Location: 1022918-DocumentHandlingCore

[SyncfusionBuild]

CI Status: FAILURE ❌
Source Compilation: SUCCESS ✅
Failure Reason: CI Failure with violation
Build Location: 1022918-DocumentHandlingCore
Technical Error(s): 0
Spelling Error(s): 0
Image Alt Text Error(s): 0
Image Size Error(s): 3
Image Name Error(s): 0
Front matter Error(s): 4
File Path Error(s): 0
CodeSnippet File Path Missing Error(s): 0
Toc Anchor Tags Validation Error(s): 0
MD Tag Validation Error(s): 0

[SyncfusionBuild]

Build Status: INQUEUE 🕒
Build Location: 1022918-DocumentHandlingCore

[SyncfusionBuild]

Build Status: INPROGRESS 🔃
Build Location: 1022918-DocumentHandlingCore

[SyncfusionBuild]

CI Status: SUCCESS ✅
Source Compilation: SUCCESS ✅
Build Location: 1022918-DocumentHandlingCore
Technical Error(s): 0
Spelling Error(s): 0
Image Alt Text Error(s): 0
Image Size Error(s): 0
Image Name Error(s): 0
Front matter Error(s): 0
File Path Error(s): 0
CodeSnippet File Path Missing Error(s): 0
Toc Anchor Tags Validation Error(s): 0
MD Tag Validation Error(s): 0

[SyncfusionBuild]

Build Status: INQUEUE 🕒
Build Location: 1022918-DocumentHandlingCore

[SyncfusionBuild]

Build Status: INPROGRESS 🔃
Build Location: 1022918-DocumentHandlingCore

[SyncfusionBuild]

CI Status: SUCCESS ✅
Source Compilation: SUCCESS ✅
Build Location: 1022918-DocumentHandlingCore
Technical Error(s): 0
Spelling Error(s): 0
Image Alt Text Error(s): 0
Image Size Error(s): 0
Image Name Error(s): 0
Front matter Error(s): 0
File Path Error(s): 0
CodeSnippet File Path Missing Error(s): 0
Toc Anchor Tags Validation Error(s): 0
MD Tag Validation Error(s): 0

[SF4524LogeshKumar]

Changes are fine.