Swaps `if`/`cond` branches for multi-clause function heads or head-pattern
matching, making the control flow visible in the function signatures:
- Navigation.determine_map_location: resolve_location/4 now dispatches on
the shape of the geolocation input and whether URL params are explicit.
- Navigation.handle_callsign_tracking: per-case clauses for empty callsign
and explicit-URL-params short-circuits, plus a final clause that does the
DB lookup and rescues once.
- Navigation.handle_callsign_search: dispatch_callsign_search/3 separates
the valid/invalid callsign branches.
- InsertOptimizer.optimize_based_on_performance: pattern-match on
[_, _, _ | _] to require ≥3 samples without calling length/1.
- InsertOptimizer.calculate_insert_options and throughput helpers split
into guarded clauses instead of inline `if`.
- maybe_emit_optimization uses same-var pattern matching to skip the
telemetry hit when nothing changed.
Adds unit tests covering every branch of both modules plus SignalHandler,
LocaleHook, and the InsertOptimizer's :noproc fallback path. Coverage
64.69% → 65.72%.
Graham McIntire
c5a82b77c1