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/errlog.go

@@ -0,0 +1,64 @@
+package app
+
+import (
+	"errors"
+	"slices"
+	"strings"
+	"time"
+
+	"git.kebcloud.no/keb/lazysecrets/internal/provider"
+	"git.kebcloud.no/keb/lazysecrets/internal/ui/panes"
+)
+
+// The status pane lists this session's errors, newest first: what a pane
+// showed (a list that couldn't load) and what the footer flashed (a copy
+// that failed), which go when you move on. Only the first line of each,
+// and never kept after quitting.
+
+// maxErrors is how many errors are kept.
+const maxErrors = 20
+
+type loggedErr struct {
+	at   time.Time
+	text string
+}
+
+// logErr records text; an error already there moves to the top, with
+// the time it happened again.
+func (m *Model) logErr(text string) {
+	text, _, _ = strings.Cut(strings.TrimSpace(text), "\n")
+	if text == "" {
+		return
+	}
+	m.errLog = slices.DeleteFunc(m.errLog, func(e loggedErr) bool { return e.text == text })
+	m.errLog = append([]loggedErr{{m.now(), text}}, m.errLog[:min(len(m.errLog), maxErrors-1)]...)
+}
+
+// logErrOf records err, about what, except a sign-in, which the footer
+// and the account's details say.
+func (m *Model) logErrOf(what string, err error) {
+	var auth *provider.AuthError
+	if !errors.As(err, &auth) {
+		m.logErr(what + ": " + err.Error())
+	}
+}
+
+// logFlash records an error the footer is showing, once.
+func (m *Model) logFlash() {
+	if m.flash.isErr && m.flash.text != m.loggedFlash {
+		m.logErr(m.flash.text)
+	}
+	m.loggedFlash = m.flash.text
+}
+
+// errorFields are the status pane's rows for them.
+func (m Model) errorFields() []panes.Field {
+	out := make([]panes.Field, len(m.errLog))
+	for i, e := range m.errLog {
+		out[i] = panes.Field{Value: e.at.Format("15:04") + " " + e.text, Err: true}
+	}
+	if len(out) > 0 {
+		out[0].Label = "errors"
+	}
+	return out
+}