Enable pasting images and text from clipboard in story creator

[apurv3170]

Contributor checklist:

• My contribution is not related to translations.
• My commits are in nice logical chunks with good commit messages
• My changes are rebased on the latest main branch
• A pnpm run ready run passes successfully (more about tests here)
• My changes are ready to be shipped to users

Description

Adds the ability to paste images and text directly into the Story Creator using Ctrl+V, without needing to save files to disk first.

What changed:

• In StoriesTab paste event listener that opens Story Creator directly on Ctrl+V / Cmd+V
• In AddStoryData added initialText to the Text variant for pre-filling pasted text
• In StoryCreator and TextStoryCreator wired initialText through the component chain

Key details:

• Images take priority if clipboard contains both image and text
• Reuses existing onAddStory handler so the full story flow works automatically

Implementation	Screenshots
Present
After

Testing:

Manually tested on Windows 11 (OS build 26200.8037):

• Copied a screenshot → navigated to Stories tab → pressed Ctrl+V → Media Story Creator opened with image
• Copied text → navigated to Stories tab → pressed Ctrl+V → Text Story Creator opened with text pre-filled
• Verified existing "Add story" button still works normally for both media and text stories

All tests passed successfully.

References:

• This addresses the feature request on community forum. Here's the reply