Add confirmation modal for blog post save/create actions

[Copilot]

Issue requested a confirmation dialog before saving blog posts, referencing Bootstrap modal documentation.

Changes

EditPost.cshtml

• Converted Save buttons from direct form submission to Bootstrap modal triggers
• Added confirmation modal: "Are you sure you want to save changes to this blog post?"

CreatePost.cshtml

• Converted Create Post button from direct form submission to Bootstrap modal trigger
• Added confirmation modal: "Are you sure you want to create this blog post?"

Implementation

Buttons changed from:

<input class="btn btn-primary" type="submit" name="submit" value="Save" />

To:

<button class="btn btn-primary" type="button" data-bs-toggle="modal" data-bs-target="#saveConfirmModal">Save</button>

Modal structure follows Bootstrap 5.3 standards with proper ARIA attributes. JavaScript handler injects hidden submit input before form submission to preserve controller routing logic. Other form actions (Upload Image, Add Category) unaffected.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Include a confirmation button for saving blog posts</issue_title>
<issue_description>https://getbootstrap.com/docs/5.3/components/modal/</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Include a confirmation button for saving blog posts #744

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