feat(ux): 🎨 add icon for system theme in ThemeSwitcher

[google-labs-jules]

This PR adds a dedicated icon for the "system" theme option in the ThemeSwitcher component to improve its intuitiveness. It also re-introduces a smooth transition animation and restores global TypeScript declarations.

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PR created automatically by Jules for task 16304822742897652376 started by @yacosta738

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[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

[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

[github-actions]

Qodana for JVM

103 new problems were found

Inspection name	Severity	Problems
Unused symbol	🔶 Warning	45
Invalid YAML configuration	🔶 Warning	8
Unstable API Usage	🔶 Warning	6
Taint analysis	🔶 Warning	4
Potentially ambiguous 'kotlin.coroutine.coroutineContext' usage	🔶 Warning	4
Unresolved reference in KDoc	🔶 Warning	2
Redundant qualifier name	🔶 Warning	2
Redundant character escape	🔶 Warning	1
Duplicated code fragment	◽️ Notice	10
Unknown HTTP header	◽️ Notice	10
Redundant interpolation prefix	◽️ Notice	4
Unnecessary type argument	◽️ Notice	2
Multi-dollar interpolation can be used in string literals (available since 2.1)	◽️ Notice	1
Redundant escaped dollar characters in string literals	◽️ Notice	1
String concatenation that can be converted to string template	◽️ Notice	1
If-Null return/break/... foldable to '?:'	◽️ Notice	1
Vulnerable declared dependency	◽️ Notice	1

☁️ View the detailed Qodana report

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