#625: add branch color

[lidaobing]

Summary by Sourcery

New Features:

• Add a primary color to the application branding.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds a primary branch color branding to the application.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added primary color branding.	Added a new branding section to the metainfo file. Set the primary color to #376ea5 for both light and dark scheme preferences.	share/metainfo/io.github.iptux_src.iptux.metainfo.xml

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[sourcery-ai]

Hey @lidaobing - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider using different colors for light and dark schemes to optimize visibility and user experience in each mode

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.47%. Comparing base (c1c92d9) to head (ae233a9).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #650   +/-   ##
=======================================
  Coverage   52.47%   52.47%           
=======================================
  Files          64       64           
  Lines        8557     8557           
=======================================
  Hits         4490     4490           
  Misses       4067     4067           

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