[WIP] Fix failing lint issues in CI workflow

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

Fix failing lint in CI workflow

Here is the relevant log:

Run golangci/golangci-lint-action@v6
prepare environment
run golangci-lint
Running [/home/runner/golangci-lint-1.64.8-linux-amd64/golangci-lint config path] in [/home/runner/work/agentmanager/agentmanager] ...
Running [/home/runner/golangci-lint-1.64.8-linux-amd64/golangci-lint config verify] in [/home/runner/work/agentmanager/agentmanager] ...
Running [/home/runner/golangci-lint-1.64.8-linux-amd64/golangci-lint run --timeout=5m] in [/home/runner/work/agentmanager/agentmanager] ...
Error: internal/systray/systray.go:15:2: could not import github.com/getlantern/systray (-: # github.com/getlantern/systray

[pkg-config --cflags -- ayatana-appindicator3-0.1]

Package ayatana-appindicator3-0.1 was not found in the pkg-config search path.
Perhaps you should add the directory containing `ayatana-appindicator3-0.1.pc'
to the PKG_CONFIG_PATH environment variable
Package 'ayatana-appindicator3-0.1', required by 'virtual:world', not found) (typecheck)
"github.com/getlantern/systray"
^
Error: internal/systray/systray.go:1048:5: a.showNativeManageAgentsWindow undefined (type *App has no field or method showNativeManageAgentsWindow) (typecheck)
a.showNativeManageAgentsWindow(agentDefs, installedAgents)
^

Error: issues found
Ran golangci-lint in 63066ms

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.