feat: disable end date input, prevent setting end to the next day [WPB-27039]

[saleniuk]

https://wearezeta.atlassian.net/browse/WPB-27039

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PR Submission Checklist for internal contributors

• The PR Title

  • conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
  • contains a reference JIRA issue number like SQPIT-764
  • answers the question: If merged, this PR will: ... ³

• The PR Description

  • is free of optional paragraphs and you have filled the relevant parts to the best of your ability

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What's new in this PR?

For the release of M1, we will only allow meetings within the start date. So we need to disabled the end-date field.
In this PR, end date input is disabled, it always uses the same value as start date and user cannot click it and choose different end date. Also, adjusting end time after selecting start time is limited so that it doesn't go beyond the current day.

Testing

Test Coverage (Optional)

• I have added automated test to this contribution

How to Test

Schedule a meeting and try to select some start and end dates to confirm that it always stays within the same day.

Attachments (Optional)

Screen_recording_20260814_132311.mp4

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PR Post Submission Checklist for internal contributors (Optional)

• Wire's Github Workflow has automatically linked the PR to a JIRA issue

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PR Post Merge Checklist for internal contributors

• If any soft of configuration variable was introduced by this PR, it has been added to the relevant documents and the CI jobs have been updated.

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References

1. https://sparkbox.com/foundry/semantic_commit_messages
2. https://github.com/wireapp/.github#usage
3. E.g. feat(conversation-list): Sort conversations by most emojis in the title #SQPIT-764.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.51%. Comparing base (fdf7a65) to head (2f084c4).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5177      +/-   ##
===========================================
- Coverage    52.74%   52.51%   -0.23%     
===========================================
  Files          659      664       +5     
  Lines        23618    23824     +206     
  Branches      3886     3929      +43     
===========================================
+ Hits         12458    12512      +54     
- Misses       10010    10152     +142     
- Partials      1150     1160      +10     

Files with missing lines	Coverage Δ
.../feature/meetings/ui/create/NewMeetingViewModel.kt	84.91% <100.00%> (+1.68%)	⬆️

... and 10 files with indirect coverage changes

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[github-actions]

Test Results

2 267 tests  +2   2 267 ✅ +2   2m 3s ⏱️ +15s
  250 suites ±0       0 💤 ±0 
  250 files   ±0       0 ❌ ±0 

Results for commit 2f084c4. ± Comparison against base commit ada3f4f.

[github-actions]

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