refactor(ui): perks section and tickets page

[marfavi]

• Converted BaristaPerksSection to a StatelessWidget as it did not utilise any stateful features.
• Transitioned BaristaPerksSection and UserRoleIndicator to accept a String instead of Role. This prevents duplicate conversion/formatting from Role to String in these widgets.
• Made tickets_page.dart more state safe by removing UserState cast and taking into account cases where UserState is not UserWithData.
• Extracted contents of TicketsPage to a private widget to maintain readablity.
• Fixed the incorrect usage of context.read inside of the build method of TicketsPage.

The refactor improves overall code maintainability and aligns with best practices for widgets that do not require internal state management.

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#### [](https://app.codesee.io/r/reviews?pr=566&src=https%3A%2F%2Fgithub.com%2FAnalogIO%2Fcoffeecard_app) #### Legend

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (65c1fb7) 68.76% compared to head (7b5e70d) 68.76%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #566 +/- ## ======================================= Coverage 68.76% 68.76% ======================================= Files 133 133 Lines 1697 1697 ======================================= Hits 1167 1167 Misses 530 530 ``` | [Flag](https://app.codecov.io/gh/AnalogIO/coffeecard_app/pull/566/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AnalogIO) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/AnalogIO/coffeecard_app/pull/566/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AnalogIO) | `68.76% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AnalogIO#carryforward-flags-in-the-pull-request-comment) to find out more.

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