viewer: click to copy values, amounts, and identifiers

Company details (EIN, state number, address, every profile value), an
entry's number and amount, an account's code and balance, a document's
file name and SHA-256 copy on click: a pointer and copy icon on hover,
a check for a moment after. Amounts copy as their exact plain decimal
(fmt::plain: no "$", commas, or parentheses; "-" for negatives); where a
click already drills down (report cells, register and transaction rows,
general ledger lines), a right-click menu copies the amounts, the entry
number, or the description. The sidebar's chain check copies the
journal head and data folder.

tests/copy.rs: every display style copies back to the exact value
(property), and clicking the EIN, an entry's amount, and its number puts
exactly that on the clipboard.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GWVo7x3UHw5kwCUaWxiejX

crates/ledger-gui/src/app.rs

@@ -675,12 +675,23 @@ fn live_status(ui: &mut Ui, b: &Books, since_update: f64, live: bool) {
                 } else {
                     (icon::WARNING_CIRCLE, p.negative)
                 };
-                ui.label(
-                    RichText::new(format!("{glyph} {text}"))
-                        .font(theme::regular(11.5))
-                        .color(color),
-                )
-                .on_hover_text(tip);
+                let r = ui
+                    .label(
+                        RichText::new(format!("{glyph} {text}"))
+                            .font(theme::regular(11.5))
+                            .color(color),
+                    )
+                    .on_hover_text(tip);
+                if text == "Journal chain verified" {
+                    r.context_menu(|ui| {
+                        crate::widgets::copy_item(ui, "Copy journal head", &b.head);
+                        crate::widgets::copy_item(
+                            ui,
+                            "Copy data folder",
+                            &b.data_dir.display().to_string(),
+                        );
+                    });
+                }
             }
         });
 }