refactor: drop dead code and use the standard library where it already does the job

No behaviour change.

- Deleted, unused or one-line wrappers: panes.RuneIndexes, Detail.Refresh (SetDescribed does it), SecretValue.Len, Query.Empty, Clipboard.Native, config.Load, get's value, Model.done, providerOf (cachefile.ProviderOf), contextWithTimeout, searchCoverage, startCrawl, showKeybindings, the expiry aliases and daysLeft.
- cmp.Or instead of the two cmpOr copies; slices.Sorted(maps.Keys(…)), maps.Copy, wg.Go, utf8.RuneCountInString and new(true) instead of loops and helpers that do the same.
- A container's pane title is set once, not twice; a redundant length check in share links and a no-op assignment in linkhandler.Launch are gone.
- Tests call ansi.Strip and lastLines directly; gofmt -s on links.go.

internal/ui/app/commands_test.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"git.kebcloud.no/keb/lazysecrets/internal/commands"
+	"github.com/charmbracelet/x/ansi"
 )
 
 func commandDriver(t *testing.T, cmds ...commands.Command) *driver {
@@ -34,7 +35,7 @@ func TestCommandGetsValueOnInput(t *testing.T) {
 	// temporary path's length.
 	shown := ""
 	if d.m.prompt != nil {
-		shown = ansiStrip(strings.Join(d.m.prompt.lines, ""))
+		shown = ansi.Strip(strings.Join(d.m.prompt.lines, ""))
 	}
 	if !strings.Contains(scr, "Run Save it?") || !strings.Contains(shown, "db-password 'team a'") || !strings.Contains(shown, "on its input") {
 		t.Fatalf("no confirmation with the command %q:\n%s", shown, scr)