Feature/v2/extract pages (#4828)

# Description of Changes

- Add the extract pages tool
- Componentize our bulk selection logic and warning messaages

---

## 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)

### Translations (if applicable)

- [ ] I ran
[`scripts/counter_translation.py`](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/docs/counter_translation.md)

### 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.

frontend/public/locales/en-GB/translation.json

@@ -1418,6 +1418,26 @@
     },
     "submit": "Remove Pages"
   },
+  "extractPages": {
+    "title": "Extract Pages",
+    "pageNumbers": {
+      "label": "Pages to Extract",
+      "placeholder": "e.g., 1,3,5-8 or odd & 1-10"
+    },
+    "settings": {
+      "title": "Settings"
+    },
+    "tooltip": {
+      "description": "Extracts the selected pages into a new PDF, preserving order."
+    },
+    "error": {
+      "failed": "Failed to extract pages"
+    },
+    "results": {
+      "title": "Pages Extracted"
+    },
+    "submit": "Extract Pages"
+  },
   "pageSelection": {
     "tooltip": {
       "header": {
@@ -1494,6 +1514,7 @@
     }
   },
   "bulkSelection": {
+    "syntaxError": "There is a syntax issue. See Page Selection tips for help.",
     "header": {
       "title": "Page Selection Guide"
     },

frontend/public/locales/en-US/translation.json

@@ -893,6 +893,26 @@
     },
     "submit": "Remove Pages"
   },
+  "extractPages": {
+    "title": "Extract Pages",
+    "pageNumbers": {
+      "label": "Pages to Extract",
+      "placeholder": "e.g., 1,3,5-8 or odd & 1-10"
+    },
+    "settings": {
+      "title": "Settings"
+    },
+    "tooltip": {
+      "description": "Extracts the selected pages into a new PDF, preserving order."
+    },
+    "error": {
+      "failed": "Failed to extract pages"
+    },
+    "results": {
+      "title": "Pages Extracted"
+    },
+    "submit": "Extract Pages"
+  },
   "pageSelection": {
     "tooltip": {
       "header": {
@@ -958,6 +978,7 @@
     }
   },
   "bulkSelection": {
+    "syntaxError": "There is a syntax issue. See Page Selection tips for help.",
     "header": { "title": "Page Selection Guide" },
     "syntax": {
       "title": "Syntax Basics",