Release 0.6.3: PRs 142, 143, 144, 145

[frozenbanana]

Summary

PR #142 feat(app): abstract application

• Introduces a new base application class and a trait for dependency-injection & telemetry
• Improves installation dependency management
• Adds an AppDependencyException for clearer install-time errors

PR #143: Adding a message on disabling external storage without disabling hejbit plug-in

• Adds a warning message when a user disables external storage but the HejBit plugin remains enabled
• Improves exception handling by switching to BaseException

PR #144: Feature/export confirmation

• Before exporting, shows a confirmation dialog with warning
• Refactors: moves download logic into its own function and updates metadata wording

PR #145: Fix/copy swarm file

• Refactors SwarmFile model to remove unused extra_fileid
• Fixes SwarmFileMapper.find to use the correct field (id vs fileid)
• Updates usages in service & storage layers
• Adds code-style fixes and general chore cleanup