chore: clear the actionable SonarCloud code smells

- S1871: merge the identical .home / .recentActivity deep-link cases in
  RootView — recent activity is a section of Home, not its own screen.
- S1186: comment the two intentionally-empty Cancel buttons
  (PatchsetDetailView, TicketDetailView) and the empty URLProtocol
  stopLoading override in APICacheTests.
- S108: comment the expected-miss catch block in APICacheTests.
- S1172: rename the unused url parameter in mimeType(for:) to _.
- S4624: extract the nested template literal in the deep-link builders
  (background.js, content.js) to a pathSegment variable.

Left as Won't Fix, with reasons: the 35 hardcoded-URI warnings (a
one-forge client and its literal-URL tests), executeCached's 8 params
(38 call sites, no benefit), the forceRefresh S1172 pair (fixed as a
real bug instead), S1481 on ArtifactsView (false positive — $vm.error
is used), and S7785 (top-level await would break a classic content
script).

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