feat: add desktop release and theme coverage notifications

[ReenigneArcher]

Description

Adds system notifications.

• version updates
• notification when theme coverage increases

Screenshot

Issues Fixed or Closed

Roadmap Issues

Type of Change

• feat: New feature (non-breaking change which adds functionality)
• fix: Bug fix (non-breaking change which fixes an issue)
• docs: Documentation only changes
• style: Changes that do not affect the meaning of the code (white-space, formatting, missing semicolons, etc.)
• refactor: Code change that neither fixes a bug nor adds a feature
• perf: Code change that improves performance
• test: Adding missing tests or correcting existing tests
• build: Changes that affect the build system or external dependencies
• ci: Changes to CI configuration files and scripts
• chore: Other changes that don't modify src or test files
• revert: Reverts a previous commit
• BREAKING CHANGE: Introduces a breaking change (can be combined with any type above)

Checklist

• Code follows the style guidelines of this project
• Code has been self-reviewed
• Code has been commented, particularly in hard-to-understand areas
• Code docstring/documentation-blocks for new or existing methods/components have been added or updated
• Unit tests have been added or updated for any new or modified functionality

AI Usage

See our AI usage policy.

• None: No AI tools were used in creating this PR
• Light: AI provided minor assistance (formatting, simple suggestions)
• Moderate: AI helped with code generation or debugging specific parts
• Heavy: AI generated most or all of the code changes

[codecov]

Codecov Report

❌ Patch coverage is 95.42484% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.70%. Comparing base (d5a49d8) to head (ed78ff1).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/common/notifications.py	95.16%	4 Missing and 2 partials ⚠️
src/common/definitions.py	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #596      +/-   ##
==========================================
+ Coverage   88.17%   88.70%   +0.52%     
==========================================
  Files          34       36       +2     
  Lines        3815     3949     +134     
  Branches      562      586      +24     
==========================================
+ Hits         3364     3503     +139     
+ Misses        303      298       -5     
  Partials      148      148              

Flag	Coverage Δ
Linux-aarch64	88.47% <95.42%> (+0.53%)	⬆️
Linux-x86_64	88.47% <95.42%> (+0.53%)	⬆️
Windows-AMD64	88.60% <95.42%> (+0.54%)	⬆️
Windows-ARM64	88.60% <95.42%> (+0.54%)	⬆️
macOS-arm64	88.47% <95.42%> (+0.53%)	⬆️
macOS-x86_64	88.47% <95.42%> (+0.53%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/common/config.py	72.72% <ø> (ø)
src/common/http.py	96.90% <100.00%> (ø)
src/common/tray_icon.py	81.73% <100.00%> (-1.00%)	⬇️
src/common/version.py	100.00% <100.00%> (ø)
src/common/webapp.py	94.41% <100.00%> (+0.76%)	⬆️
src/themerr/cache.py	90.90% <100.00%> (+0.90%)	⬆️
src/themerr/scheduled_tasks.py	95.38% <100.00%> (+0.22%)	⬆️
src/themerr_plex.py	66.15% <100.00%> (+2.58%)	⬆️
src/common/definitions.py	83.33% <50.00%> (+11.59%)	⬆️
src/common/notifications.py	95.16% <95.16%> (ø)

---

Continue to review full report in Codecov by Harness.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d5a49d8...ed78ff1. Read the comment docs.

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud