fix: unambiguous repo key names, clearer config and key names, and a newer lazysecrets's files no longer stop an older one (#66)

Changes that would break configs or links once people use lazysecrets, made while nobody does yet.

- **Repo key names**: a dot or bracket inside a key is escaped (`app\.name`), so links to it resolve to that key and not to `app` → `name`. Dotenv files are flat, so their names stay as they are.
- **Config**: `updates.updateSources` is now `updates.sources`. A negative provider timeout, or `--timeout` of 0 or less, is an error instead of making every request fail.
- **Keybindings**: `lists.share` is now `lists.copyLink`, `lists.search` is `lists.goTo` and `lists.enter` is `lists.open`, matching what they do.
- **Version skew**, e.g. a lazysecrets.nvim theme file made for a newer lazysecrets:
  - an unknown theme role is skipped with a warning instead of stopping startup;
  - a state file from a newer version is read but not saved to, with a warning;
  - a link with an unknown provider suggests `lazysecrets update`.

Reviewed-on: #66
Co-authored-by: Karl-Einar Bergstrøm <karl-einarb@outlook.com>

internal/ui/styles/theme_test.go

@@ -44,19 +44,29 @@ func TestFromTheme(t *testing.T) {
 
 func TestFromThemeRejectsMistakes(t *testing.T) {
 	for name, theme := range map[string]map[string][]string{
-		"role":    {"activeBorder": {"red"}},
 		"colour":  {"errorColor": {"redish"}},
 		"hex":     {"errorColor": {"#fff"}},
 		"palette": {"errorColor": {"300"}},
 	} {
 		if _, _, err := FromTheme(theme); err == nil {
 			t.Errorf("%s: no error", name)
-		} else if name == "role" && !strings.Contains(err.Error(), "activeBorderColor") {
-			t.Errorf("unknown role error should list the known ones: %v", err)
 		}
 	}
 }
 
+func TestUnknownRolesSkipped(t *testing.T) {
+	theme := map[string][]string{"activeBorder": {"red"}, "errorColor": {"red"}}
+	if _, _, err := FromTheme(theme); err != nil {
+		t.Errorf("unknown role failed the theme: %v", err)
+	}
+	if w := Unknown(theme); !strings.Contains(w, "unknown activeBorder ") || strings.Contains(w, "errorColor") {
+		t.Errorf("warning = %q", w)
+	}
+	if w := Unknown(map[string][]string{"errorColor": {"red"}}); w != "" {
+		t.Errorf("warning for known roles: %q", w)
+	}
+}
+
 func TestEmptyThemeIsDefault(t *testing.T) {
 	st, fg, err := FromTheme(nil)
 	if err != nil || fg != nil || st.Selected.GetReverse() || st.Selected.GetBackground() != lipgloss.BrightBlack {