feat(app): report mutations on stderr and say what --web opens

Mutations printed a list row, or nothing, so a person could not tell
what changed and scripts parsed rows meant for people. Commands now get
the helpers for the gh convention:

- done and warn print "✓ Closed issue alice/x#5 (Fix login)" and
  "! … is already closed" to stderr, only when stdout is a terminal and
  --json is not set.
- printURL prints a created resource's URL to stdout unless --json is
  set, so url=$(tea issue create …) works.
- batchDone applies a mutation to several selections like batch and
  reports each success with a done line instead of a table.
- issueRef formats "alice/x#5 (title)" references.

--web now prints "Opening localhost:3001/alice/project/issues/1 in your
browser." to stderr on a terminal before the browser starts.

Signed-off-by: bircni <bircni@icloud.com>

internal/app/browser.go

@@ -3,12 +3,27 @@
 
 package app
 
-import "github.com/spf13/cobra"
+import (
+	"fmt"
+	"strings"
 
+	"gitea.dev/tea/internal/terminal"
+	"github.com/spf13/cobra"
+)
+
+// openBrowser opens resource in the configured browser, telling people on a terminal what opens.
 func (a *application) openBrowser(command *cobra.Command, resource string) error {
 	preferences, err := a.preferences()
 	if err != nil {
 		return err
 	}
+	if a.deps.Streams.OutTTY {
+		fmt.Fprintf(command.ErrOrStderr(), "Opening %s in your browser.\n", displayURL(resource))
+	}
 	return a.deps.Browser.Open(command.Context(), resource, preferences.Browser)
 }
+
+// displayURL shows a URL to people without its scheme, like gh.
+func displayURL(url string) string {
+	return terminal.SafeLine(strings.TrimPrefix(strings.TrimPrefix(url, "https://"), "http://"))
+}