refactor: one copy of the UI's repeated helpers (#77)

- Text inputs come from newTextInput; the link and folder prompts share one width.
- One starred-first sort for sources, vaults and secrets; accountOf where the account was cut from the label by hand.
- One helper each for the reveal and clipboard countdowns' tick and seconds, the "Open with" choices, the vaults-loaded count, and Go to's and the panes' tabs.
- The details pane builds its label prefix, indent, note and source once; list rows mark matches with MarkMatches.
- The release page opens through openPage, so it now says it opened, as other pages do.
- The cache's account filter is built once per load or save, not per key.

Reviewed-on: #77
Co-authored-by: Karl-Einar Bergstrøm <karl-einarb@outlook.com>

internal/ui/app/jump.go

@@ -199,18 +199,7 @@ func (m *Model) jumpTo(r ref.Ref, n store.Node) tea.Cmd {
 		m.startNav(r, actGo, sourceRowKey(n.Account, n.Source))
 		return nil
 	}
-	var choices []choice
-	for _, p := range m.providers {
-		if p.Kind() != r.Kind {
-			continue
-		}
-		for _, src := range m.sourceResults[p.ID()].sources {
-			if src.ID == n.Source && n.Source != "" {
-				row := sourceRowKey(p.ID(), src.ID)
-				choices = append(choices, choice{label: "Open with " + m.sourceLabel(row), sourceRow: row})
-			}
-		}
-	}
+	choices := m.openWith(r.Kind, func(src provider.Source) bool { return src.ID == n.Source && n.Source != "" })
 	switch len(choices) {
 	case 0:
 		return m.openRef(r, actGo)