feat: implement structured feedback modal and integrate feedback service

[ToxicBiohazard]

Types of changes

What types of changes does your code introduce?
Put an x in the boxes that apply.

• Bugfix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality not to work as expected).
• Documentation Update (if none of the other choices applies).

Proposed changes

• Added a new FeedbackModal to collect structured feedback from users.
• Integrated feedback submission to a new feedback service API, with fallbacks to Slack if the service is not configured.
• Introduced constants for feedback kinds and platforms to align with the feedback service schema.
• Updated configuration to include feedback service URL and API key.
• Added tests for feedback modal functionality and feedback service integration.

Checklist

Put an x in the boxes that apply.

• I have read and followed the CONTRIBUTING.md
  doc.
• Lint and unit tests pass locally with my changes.
• I have added the necessary documentation (if appropriate).

[codecov]

Codecov Report

❌ Patch coverage is 81.91489% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.97%. Comparing base (628170a) to head (4cb5103).

Files with missing lines	Patch %	Lines
src/cmds/core/other.py	79.03%	13 Missing ⚠️
src/helpers/feedback_service.py	80.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #186      +/-   ##
==========================================
+ Coverage   65.15%   65.97%   +0.81%     
==========================================
  Files          52       54       +2     
  Lines        3042     3121      +79     
==========================================
+ Hits         1982     2059      +77     
- Misses       1060     1062       +2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.