P3: rename accounts, one set of period defaults, tax categories warn or refuse (defects 15, 16, 8)

books.rename_account; account names trimmed, bounded, refused when a
sibling's or TIN-shaped; books.show refuses what its target ignores. A
report asked for without dates covers this fiscal year so far, everywhere
(one rule for tools, descriptions and the viewer; the IIF and CPA package
keep their own dates). policy.require_tax_category warns or refuses; a
Form 4797 gain is shown apart on every return.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01T3gXMVt7XJPi6ens1or9Dj

crates/ledger-gui/tests/screens.rs

@@ -1,6 +1,7 @@
 //! Screenshots of every screen, for eyes. Set `SHOT_BOOKS` to a books dir
 //! (containing `books-data/`, its settings in its journal) and `SHOT_DIR` to
-//! where the PNGs go; without them this test does nothing.
+//! where the PNGs go; without them this test does nothing. `SHOT_REGISTER=all`
+//! shows an account's register on every date instead of its default.
 
 use egui_kittest::Harness;
 use ledger_gui::nav::{ReportKind, Route};
@@ -153,6 +154,12 @@ fn screenshots() {
         if std::env::var("SHOT_LIVE").is_ok() {
             harness.state_mut().show_live_label();
         }
+        // SHOT_REGISTER=all: a register showing every date (after "Show
+        // all dates"); otherwise it opens on the default period.
+        if std::env::var("SHOT_REGISTER").is_ok_and(|r| r == "all") {
+            harness.state_mut().state_mut().accounts.range =
+                ledger_gui::pages::accounts::RegisterRange::All;
+        }
         harness.run_steps(4);
         let ctx = harness.ctx.clone();
         harness.state_mut().settle(&ctx);