chore: remove feedback dialog

[Patrick-Erichsen]

Summary by cubic

Removed the feedback dialog and all related code from the chat page. This cleans up the UI and stops showing the feedback popup after repeated use.

[netlify]

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[RomneyDa]

Can also remove local storage "mainTextEntryCounter" value in localstorage.ts

[cubic-dev-ai]

cubic reviewed 1 file and found no issues. Review PR in cubic.dev.

[Patrick-Erichsen]

@RomneyDa good callout, also removed some other stale code

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