feat: improve Board View - add Assignee filter and improved cursor handling

[skomae]

Adds ability to filter Board View by Assignee

Improves cursor handling so cursor scrolls to next available item, even when columns are empty. Ensure highlighted issue always remains in view.

[mk-5]

@skomae thanks for that PR!

I need a little more time to look on it, but I will do it for soon

[skomae]

Thanks @mk-5

You'll note I've added additional commits since posting the PR:

• add --board= param to startup for setting a board id
• fix feature removal for selecting and moving an issue with [Enter]
• board view now filters to use issues from the current sprint only

[codecov]

Codecov Report

❌ Patch coverage is 53.41365% with 116 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.90%. Comparing base (664f0c3) to head (f2ff1a0).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/boards/board_view.go	60.66%	48 Missing and 11 partials ⚠️
internal/fjira/fjira.go	0.00%	33 Missing and 1 partial ⚠️
internal/jira/jira_boards.go	47.36%	18 Missing and 2 partials ⚠️
internal/app/app.go	57.14%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #141      +/-   ##
==========================================
- Coverage   81.16%   78.90%   -2.26%     
==========================================
  Files          67       67              
  Lines        3329     3551     +222     
==========================================
+ Hits         2702     2802     +100     
- Misses        489      596     +107     
- Partials      138      153      +15     

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