chore: add mode and theme migration

[vladimirpotekhin]

Closes #

[lumberjack-bot[bot]]

Pull request was closed :heavy_check_mark:

All saved screenshots (for current PR) were deleted :wastebasket:

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 5f2a2bd):

https://taiga-ui--pr7944-mode-theme-migration-pv5a053h.web.app

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_{Sign: 4b5ece1e114386f6a105425ef799091475b249eb}

[bundlemon[bot]]

BundleMon

Unchanged files (5)

Status | Path | Size | Limits :------------: | ------------ | :------------: | :------------: :white_check_mark: | demo/browser/main.(hash).js
| 276.99KB | +10% :white_check_mark: | demo/browser/vendor.(hash).js
| 236.35KB | +10% :white_check_mark: | demo/browser/runtime.(hash).js
| 40.58KB | +10% :white_check_mark: | demo/browser/styles.(hash).css
| 12.76KB | +10% :white_check_mark: | demo/browser/polyfills.(hash).js
| 11.21KB | +10%

Total files change -5B 0%

Groups updated (1)

Status | Path | Size | Limits :------------: | ------------ | :------------: | :------------: :white_check_mark: | demo/browser/*..js
| 6.53MB (+173B 0%) | -

Final result: :white_check_mark:

View report in BundleMon website ➡️

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Current branch size history | Target branch size history