web: reader link to the left, downloads into a "pobierz" disclosure

Finish the top-bar rework. The reader entry point now leads the controls
bar on the far left (it was in the right-hand cluster); settings stays in
the top-right cluster.

The flat "download: txt md pdf · kalendarz" strip becomes a single
"pobierz" summary that opens a small floating panel with two rows:
 - a month calendar with its own month + year <select> pickers (localised
   month names, both pre-selected from the shown date) and a PDF button
   that hits /calendar?month=YYYY-MM;
 - the shown day's readings as txt/md/pdf, labelled with the date.

The panel is absolutely positioned under the link so opening it doesn't
reflow the bar. indexData gains MonthOpts/YearOpts (a calOpt list); the
year picker is a small window around the shown year.

1 files changed, 31 insertions, 1 deletions

diff --git a/internal/web/server.go b/internal/web/server.go
index 7d9dfe5..f02bc12 100644
--- a/internal/web/server.go
+++ b/internal/web/server.go
@@ -219,6 +219,10 @@ type indexData struct {
 	Display                  string
 	Mono                     bool
 	Reading                  template.HTML
+	// MonthOpts/YearOpts populate the "pobierz" panel's month-calendar
+	// download pickers (localised month names + a year window around the
+	// shown date).
+	MonthOpts, YearOpts []calOpt
 	// L holds the localised control labels (lectionary/layout/theme/...),
 	// set from i18n.Get(cfg.UILanguage) -- index.html references its
 	// fields (e.g. {{.L.Lectionary}}) instead of hardcoded Polish text.
@@ -232,6 +236,13 @@ type versionOpt struct {
 	Checked bool
 }
 
+// calOpt is one <option> in the pobierz panel's month or year picker.
+type calOpt struct {
+	Val   int
+	Label string
+	Sel   bool
+}
+
 type themeOpt struct {
 	Name     string
 	Selected bool
@@ -276,6 +287,23 @@ func indexHandler(cfg config.Config) http.HandlerFunc {
 			themeOpts = append(themeOpts, themeOpt{Name: name, Selected: name == theme})
 		}
 
+		// Month/year pickers for the "pobierz" panel's month-calendar download.
+		// Selected from the shown date; the year list is a small window around
+		// it so the shown year is always present and pre-selected.
+		labels := i18n.Get(cfg.UILanguage)
+		selYear, selMonth := 0, 0
+		if t, err := time.Parse("2006-01-02", date); err == nil {
+			selYear, selMonth = t.Year(), int(t.Month())
+		}
+		monthOpts := make([]calOpt, 0, 12)
+		for i, name := range labels.Months {
+			monthOpts = append(monthOpts, calOpt{Val: i + 1, Label: name, Sel: i+1 == selMonth})
+		}
+		yearOpts := make([]calOpt, 0, 6)
+		for y := selYear - 2; y <= selYear+3; y++ {
+			yearOpts = append(yearOpts, calOpt{Val: y, Label: strconv.Itoa(y), Sel: y == selYear})
+		}
+
 		data := indexData{
 			Date:        date,
 			PrevDate:    shiftDate(date, -1),
@@ -288,7 +316,9 @@ func indexHandler(cfg config.Config) http.HandlerFunc {
 			Display:     display,
 			Mono:        queryBool(r, "mono", cfg.WebMono),
 			Reading:     reading,
-			L:           i18n.Get(cfg.UILanguage),
+			MonthOpts:   monthOpts,
+			YearOpts:    yearOpts,
+			L:           labels,
 			Lang:        cfg.UILanguage,
 		}