Stirling 2.0 (#3928)

# Description of Changes

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File context for managing files between tools and views
Optimisation for large files
Updated Split to work with new file system and match Matts stepped
design closer

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---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing)
for more details.

---------

Co-authored-by: Anthony Stirling <[email protected]>

frontend/package-lock.json

@@ -25,6 +25,7 @@
         "i18next": "^25.2.1",
         "i18next-browser-languagedetector": "^8.1.0",
         "i18next-http-backend": "^3.0.2",
+        "jszip": "^3.10.1",
         "pdf-lib": "^1.17.1",
         "pdfjs-dist": "^3.11.174",
         "react": "^19.1.0",
@@ -2689,6 +2690,11 @@
         "node": ">=18"
       }
     },
+    "node_modules/core-util-is": {
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+      "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.3.tgz",
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@@ -3450,6 +3456,11 @@
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+      "resolved": "https://registry.npmjs.org/immediate/-/immediate-3.0.6.tgz",
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-      "license": "ISC",
-      "optional": true
+      "license": "ISC"
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     "node_modules/is-arrayish": {
       "version": "0.2.1",
@@ -3571,6 +3581,11 @@
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+      "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
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       "resolved": "https://registry.npmjs.org/jiti/-/jiti-2.4.2.tgz",
@@ -3630,6 +3645,52 @@
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+    "node_modules/jszip": {
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+      "resolved": "https://registry.npmjs.org/jszip/-/jszip-3.10.1.tgz",
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+        "pako": "~1.0.2",
+        "readable-stream": "~2.3.6",
+        "setimmediate": "^1.0.5"
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+    "node_modules/jszip/node_modules/readable-stream": {
+      "version": "2.3.8",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.8.tgz",
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+      "dependencies": {
+        "core-util-is": "~1.0.0",
+        "inherits": "~2.0.3",
+        "isarray": "~1.0.0",
+        "process-nextick-args": "~2.0.0",
+        "safe-buffer": "~5.1.1",
+        "string_decoder": "~1.1.1",
+        "util-deprecate": "~1.0.1"
+      }
+    },
+    "node_modules/jszip/node_modules/safe-buffer": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
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+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
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+      "resolved": "https://registry.npmjs.org/lie/-/lie-3.3.0.tgz",
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       "version": "1.30.1",
       "resolved": "https://registry.npmjs.org/lightningcss/-/lightningcss-1.30.1.tgz",
@@ -4729,6 +4790,11 @@
         "node": ">= 0.8"
       }
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+    "node_modules/process-nextick-args": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.1.tgz",
+      "integrity": "sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag=="
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@@ -5237,6 +5303,11 @@
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       "license": "MIT"
     },
+    "node_modules/setimmediate": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/setimmediate/-/setimmediate-1.0.5.tgz",
+      "integrity": "sha512-MATJdZp8sLqDl/68LfQmbP8zKPLQNV6BIZoIgrscFDQ+RsvK/BxeDQOgyxKKoh0y/8h3BqVFnCqQ/gd+reiIXA=="
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       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.7.tgz",
@@ -5697,7 +5768,6 @@
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-      "devOptional": true,
       "license": "MIT"
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     "node_modules/vite": {