🐛 Fixed Mastodon settings input overwriting

[AsishKumarDalal]

This PR fixes a frustrating issue where typing a Mastodon handle (e.g., @username@instance.tld) in the social settings would immediately overwrite the input and cause the cursor to jump mid-typing.

To fix this:

1. We still validate onChange so users see formatting errors immediately, but we don't overwrite or format the value yet.
2. The actual normalization/formatting and state updates are deferred to onBlur (when clicking away).
3. Added a final normalization check onSave in case the user hits save directly.

This matches how other social media fields in Ghost behave and makes typing handles smooth.

• I've read and followed the Contributor Guide
• I've explained my change
• I've written an automated test to prove my change works

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