feat: formatted JSON and certificates, errors in the status pane, no scope access list (#19)

**Formatted values.** A revealed value is shown as it reads best: JSON indented, and PEM certificates as subject, issuer, valid dates, names and SHA-1 thumbprint instead of base64. Any other PEM block (a private key in a bundle) is named, `EC PRIVATE KEY (not shown)`, never shown. Anything else shows as before. `y` copies the value exactly as stored, and the hints line says so (`JSON, formatted: y copies it as stored`).

**Errors in the status pane.** This session's errors, newest first, up to 20, with the time and what they were about (`12:32 kv-restricted: 403 Forbidden: …`): lists that couldn't load, values and details that couldn't be read, sources, saving the cache, and whatever the footer flashed (a failed copy) before you moved on. A repeat moves to the top. Sign-ins aren't listed (the footer and the account say those). Only the first line of each, and not kept after quitting. `y` copies one.

**No access list for Databricks scopes.** It was the one request of its own left (one call per scope). Removed with its tests and docs; refusals still say what to check.

**Copying over SSH: checked, nothing to change.** Over SSH (`SSH_TTY`/`SSH_CONNECTION`), `y` copies with OSC 52, and the 30-second clear works the same way. Your tmux (3.7, `set-clipboard on`) passes it through and kitty (`clipboard_control write-clipboard`) accepts it; docs/config.md already says what's needed.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Karl-Einar Bergstrøm <karl-einarb@outlook.com>
Reviewed-on: #19

internal/ui/app/app_test.go

@@ -1300,3 +1300,25 @@ func TestExpiringInStatus(t *testing.T) {
 		t.Errorf("enter went to %s/%s\n%s", v, o, d.screen())
 	}
 }
+
+func TestErrorLog(t *testing.T) {
+	t.Parallel()
+	d := newDriverOpts(t, Options{}, fake.Azure(0))
+	d.keys("2", "j", "j", "3") // kv-restricted: its secrets can't be listed
+	d.m.flash = flash{text: "copy failed: no clipboard", isErr: true}
+	d.send(nil)
+	d.send(nil) // still showing: logged once
+	d.keys("0")
+	scr := d.screen()
+	if !strings.Contains(scr, "errors") || !strings.Contains(scr, "copy failed: no clipboard") || !strings.Contains(scr, "kv-restricted: 403 Forbidden") {
+		t.Errorf("errors not listed:\n%s", scr)
+	}
+	if n := len(d.m.errLog); n != 2 || !strings.HasPrefix(d.m.errLog[0].text, "copy failed") {
+		t.Errorf("log %+v", d.m.errLog)
+	}
+	d.m.logErr("403 Forbidden: again") // a new one, and an old one again: on top
+	d.m.logErr(d.m.errLog[2].text)
+	if len(d.m.errLog) != 3 || d.m.errLog[0].text == "403 Forbidden: again" {
+		t.Errorf("log %+v", d.m.errLog)
+	}
+}