P3: depreciation straight-line by days through the final month, schedules by day (defects 22, 9, D-37)

The final month takes what the months before leave, spread over its days;
a disposed asset stops on its disposal day. A skipped month is caught up
in the month the run is made; a reversed run un-posts its month. New
schedules spread by day; equal-months schedules must start on the 1st.
Amounts round to the currency's own minor unit. Kani and Lean proofs; an
exhaustive search over runs, reversals and disposals.

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

crates/ledger-gui/src/pages/journal.rs

@@ -856,7 +856,15 @@ pub fn describe(b: &Books, line: &JournalLine) -> Option<Event> {
         ),
         "schedule.registered" => ev(
             icon::CALENDAR,
-            format!("Schedule: {}", s(p, "description")),
+            format!(
+                "Schedule: {} ({})",
+                s(p, "description"),
+                // Journals before P3 carry no convention: equal months.
+                match s(p, "convention") {
+                    "daily" => "by the day",
+                    _ => "equal months",
+                }
+            ),
             Some(Route::Company),
         ),
         "schedule.posted" => ev(