gui: Save PDF on every report; short and narrow windows hold up

Reports get a Save PDF button beside Copy for a spreadsheet. It typesets
the report as it's set up on screen (range, months/quarters/years,
comparison) through ledger-import's Typst statement template, the same
one the CPA package uses, in the background, writes it to the Downloads
folder (never the books: the viewer stays read-only), and opens it.

- ledger-import: Statement.percent_from marks percentage columns
  (comparison %, % of income), typeset as 12.5% with no dollar sign;
  wide statements turn the page, and past seven columns set smaller so
  a year of months fits; statement() is public for other callers.
- Compared columns that read the same (Jan 1 - Oct 12 vs a year
  earlier) now say which year, on screen and on paper.
- Short windows: the sidebar's and rail's links scroll above the status
  box instead of under it. The search palette fits the window.
- A test typesets every table-backed report from the demo books,
  plain, by month, and compared (PDF_DIR keeps the files).

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

crates/ledger-gui/src/palette.rs

@@ -71,7 +71,9 @@ impl Palette {
                     .inner_margin(Margin::same(10)),
             )
             .show(ctx, |ui| {
-                ui.set_width(620.0);
+                // Never wider or taller than the window allows.
+                let screen = ctx.content_rect().size();
+                ui.set_width(620.0_f32.min(screen.x - 48.0).max(200.0));
                 let edit = egui::TextEdit::singleline(&mut self.query)
                     .hint_text("Search entries, accounts, vendors, documents, reports…")
                     .font(theme::regular(16.0))
@@ -89,7 +91,7 @@ impl Palette {
                 crate::widgets::rule(ui);
                 ui.add_space(4.0);
                 egui::ScrollArea::vertical()
-                    .max_height(420.0)
+                    .max_height(420.0_f32.min(screen.y - 160.0).max(120.0))
                     .show(ui, |ui| {
                         if items.is_empty() {
                             ui.label(RichText::new("Nothing matches.").color(p.muted));