feat: save input text draft into local storage

[uinstinct]

Description

Save the unsubmitted input text into local storage so that it persists between reloads and page changes.

resolves CON-5281

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Checklist

• [] I've read the contributing guide
• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

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before.mp4

after.mp4

Tests

[ What tests were added or updated to ensure the changes work as expected? ]

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Summary by cubic

Persist unsubmitted main input drafts in local storage so text survives reloads and navigation. Drafts auto-load per chat and clear on submit or when input is empty. Resolves CON-5281.

• New Features

  • Save main input content as JSON under inputDraft_ on change.
  • Load saved draft when the main input editor initializes.
  • Clear stored draft after successful submission or when content becomes empty.
  • Added localStorage type for inputDraft_.

• Refactors

  • Removed the clearContent effect in TipTapEditor to prevent wiping drafts on mount.

^{Written for commit e2a38e3. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 3 files