refactor: one copy of the UI's repeated helpers

- 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.

internal/ui/app/modal.go

@@ -75,10 +75,8 @@ type modal struct {
 
 // showFilterMenu opens a menu with a filter input above the options.
 func (m *Model) showFilterMenu(title string, options []option) tea.Cmd {
-	in := textinput.New()
-	in.Prompt = "/"
+	in := newTextInput("/", 40)
 	in.Placeholder = "type to filter"
-	in.SetWidth(40)
 	m.prompt = &modal{title: title, options: options, all: options, filter: &in}
 	m.prompt.move(0)
 	m.flash = flash{}