feat: Go to scopes are grouped like the Sources pane, an account at a time

The scope list follows the Sources pane: All, then each account (or
Databricks, or Repos) with its sources under it, in place of All Azure,
All Databricks and All repos. An account scope searches and loads only
that account. ctrl+s on a group header narrows to its group.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

internal/ui/app/search.go

@@ -131,13 +131,25 @@ func (c coverage) complete() bool {
 	return c.sourcesListed == c.sources && c.vaultsLoaded == c.vaults
 }
 
-func (m *Model) searchCoverage() coverage { return m.coverageOf("") }
+func (m *Model) searchCoverage() coverage { return m.coverageOf(nil) }
 
-// coverageOf is searchCoverage for one kind of provider ("" for all).
-func (m *Model) coverageOf(kind provider.Kind) coverage {
+// providerFilter picks the providers a search or a load covers; nil is
+// all of them.
+type providerFilter func(provider.Provider) bool
+
+func ofKind(k provider.Kind) providerFilter {
+	return func(p provider.Provider) bool { return p.Kind() == k }
+}
+
+func ofProvider(id string) providerFilter {
+	return func(p provider.Provider) bool { return p.ID() == id }
+}
+
+// coverageOf is searchCoverage for the providers in.
+func (m *Model) coverageOf(in providerFilter) coverage {
 	var c coverage
 	for _, p := range m.providers {
-		if kind != "" && p.Kind() != kind {
+		if in != nil && !in(p) {
 			continue
 		}
 		for _, src := range m.sourceResults[p.ID()].sources {
@@ -197,12 +209,12 @@ func plural(n int, word string) string {
 
 // startCrawl loads every unlisted subscription's vaults and every vault's
 // secrets not loaded yet.
-func (m *Model) startCrawl() tea.Cmd { return m.startCrawlOf("") }
+func (m *Model) startCrawl() tea.Cmd { return m.startCrawlOf(nil) }
 
-// startCrawlOf is startCrawl for one kind of provider ("" for all).
-func (m *Model) startCrawlOf(kind provider.Kind) tea.Cmd {
+// startCrawlOf is startCrawl for the providers in.
+func (m *Model) startCrawlOf(in providerFilter) tea.Cmd {
 	for _, p := range m.providers {
-		if kind != "" && p.Kind() != kind {
+		if in != nil && !in(p) {
 			continue
 		}
 		for _, src := range m.sourceResults[p.ID()].sources {