Consolidate desktop controls with editable holidays and a running-window tray

crates/ferese-config/data/README.md

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+# Japanese holiday function and official reference
+
+Source: Cabinet Office, [国民の祝日について](https://www8.cao.go.jp/chosei/shukujitsu/gaiyou.html).
+
+- CSV: https://www8.cao.go.jp/chosei/shukujitsu/syukujitsu.csv
+- Retrieved: 2026-10-28
+- Original SHA-256: `cec37a743c96995cdb9cb52b685c9003634682a9b0e1a640a6b9b96881fe964a`
+- Coverage: 1955-01-01 through 2027-11-23
+- Conversion: CP932 to UTF-8; dates normalized to YYYY-MM-DD; header removed.
+
+`japanese-holidays.rhai` is the editable, built-in runtime data source. It calculates 1955–2099 Japanese holidays, including historical rules and one-off exceptions. Unpublished years are estimates; equinox holidays become official after publication in the government gazette. See [NAOJ](https://www.nao.ac.jp/faq/a0301.html).
+
+The CSV is an independent regression reference, including substitute holidays and holidays between national holidays. The full function output is checked against every date and name for 1955–2027. To refresh the reference, download the official CSV, apply the same conversion, update exceptions in the function as needed, and rerun calendar tests.
+
+Source terms: [Cabinet Office website terms](https://www.cao.go.jp/notice/rule.html).

crates/ferese-config/data/japanese-holidays.rhai

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+// 日本祝日计算函数。返回 YYYY-MM-DD → 节假日名称的映射。
+// weekday(date) 的周日为 0；date(year, month, day) 与 add_days(date, n) 生成日期。
+// 规则适用 1955–2099 年；未公布年份的春秋分日为近似计算。
+fn monday(year, month, nth) {
+    let first = date(year, month, 1);
+    1 + (8 - weekday(first)) % 7 + 7 * (nth - 1)
+}
+
+fn japanese_holidays(year) {
+    let h = #{};
+    if year < 1955 || year > 2099 { return h; }
+    h[date(year, 1, 1)] = "元日";
+    h[date(year, 1, if year >= 2000 { monday(year, 1, 2) } else { 15 })] = "成人の日";
+    if year >= 1967 { h[date(year, 2, 11)] = "建国記念の日"; }
+    if year >= 2020 { h[date(year, 2, 23)] = "天皇誕生日"; }
+    if year >= 1989 && year <= 2018 { h[date(year, 12, 23)] = "天皇誕生日"; }
+    h[date(year, 4, 29)] = if year >= 2007 { "昭和の日" }
+        else if year >= 1989 { "みどりの日" } else { "天皇誕生日" };
+
+    // 春分・秋分近似式。官报公布前的将来日期仅为推算。
+    let spring_base = if year < 1980 { 20.8357 } else { 20.8431 };
+    let autumn_base = if year < 1980 { 23.2588 } else { 23.2488 };
+    let leap_base = if year < 1980 { 1983 } else { 1980 };
+    let shift = 0.242194 * (year - 1980) - (year - leap_base) / 4;
+    h[date(year, 3, floor(spring_base + shift))] = "春分の日";
+    h[date(year, 9, floor(autumn_base + shift))] = "秋分の日";
+    h[date(year, 5, 3)] = "憲法記念日";
+    if year >= 2007 { h[date(year, 5, 4)] = "みどりの日"; }
+    h[date(year, 5, 5)] = "こどもの日";
+    h[date(year, 11, 3)] = "文化の日";
+    h[date(year, 11, 23)] = "勤労感謝の日";
+
+    if year >= 1966 {
+        h[date(year, 9, if year >= 2003 { monday(year, 9, 3) } else { 15 })] = "敬老の日";
+        let sport = if year == 2020 { date(year, 7, 24) }
+            else if year == 2021 { date(year, 7, 23) }
+            else { date(year, 10, if year >= 2000 { monday(year, 10, 2) } else { 10 }) };
+        h[sport] = if year >= 2020 { "スポーツの日" }
+            else if year == 2019 { "体育の日（スポーツの日）" } else { "体育の日" };
+    }
+    if year >= 1996 {
+        let sea = if year == 2020 { date(year, 7, 23) }
+            else if year == 2021 { date(year, 7, 22) }
+            else { date(year, 7, if year >= 2003 { monday(year, 7, 3) } else { 20 }) };
+        h[sea] = "海の日";
+    }
+    if year >= 2016 {
+        h[date(year, 8, if year == 2020 { 10 } else if year == 2021 { 8 } else { 11 })] = "山の日";
+    }
+    // 即位・成婚等の特例。
+    if year == 1959 { h[date(year, 4, 10)] = "結婚の儀"; }
+    if year == 1989 { h[date(year, 2, 24)] = "大喪の礼"; }
+    if year == 1990 { h[date(year, 11, 12)] = "即位礼正殿の儀"; }
+    if year == 1993 { h[date(year, 6, 9)] = "結婚の儀"; }
+    if year == 2019 {
+        h[date(year, 5, 1)] = "休日（祝日扱い）";
+        h[date(year, 10, 22)] = "休日（祝日扱い）";
+    }
+    let national = h;
+    let first = date(year, 1, 1);
+    // 祝日に挟まれた日：1986 年から適用、日曜日は対象外。
+    if year >= 1986 {
+        for day in 0..days_in_year(year) {
+            let d = add_days(first, day);
+            if weekday(d) != 0 && !h.contains(d)
+                && national.contains(add_days(d, -1)) && national.contains(add_days(d, 1)) {
+                h[d] = "休日";
+            }
+        }
+    }
+    // 振替休日：1973 年導入、2007 年以降は次の祝日でない日まで繰り越す。
+    for d in national.keys() {
+        if d >= "1973-04-12" && weekday(d) == 0 {
+            let substitute = add_days(d, 1);
+            if year >= 2007 {
+                while h.contains(substitute) { substitute = add_days(substitute, 1); }
+            }
+            if !h.contains(substitute) { h[substitute] = "休日"; }
+        }
+    }
+    h
+}