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.

3 files changed, 88 insertions, 13 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,
 		}
 
diff --git a/internal/web/static/base.css b/internal/web/static/base.css
index 757e935..b5f4f13 100644
--- a/internal/web/static/base.css
+++ b/internal/web/static/base.css
@@ -322,9 +322,34 @@ a {
   gap: var(--space-2);
 }
 
-/* Export links (download the readings). */
-.export { font-family: var(--font-ui); font-size: 0.85rem; }
-.export a { margin: 0 0.15rem; }
+/* "pobierz" disclosure: a summary styled as a nav link that reveals a small
+ * floating panel of download options (a month calendar with its own month/year
+ * pickers, and the shown day's txt/md/pdf export). The panel is absolutely
+ * positioned under the link so opening it never reflows the controls bar.
+ * Colour (border/background) is the theme's, via the shared --bg/--fg tokens. */
+.export { position: relative; font-family: var(--font-ui); font-size: 0.85rem; }
+.export > summary { cursor: pointer; list-style: none; }
+.export > summary::-webkit-details-marker { display: none; }
+.export > summary::after { content: " \25be"; } /* down caret */
+.export[open] > summary::after { content: " \25b4"; } /* up caret */
+.export-panel {
+  position: absolute;
+  right: 0;
+  top: calc(100% + 0.35rem);
+  z-index: 10;
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-1);
+  padding: var(--space-2);
+  border-width: 1px;
+  border-style: solid;
+  background: var(--bg);
+  white-space: nowrap;
+}
+.export-row { display: flex; align-items: center; gap: 0.5rem; }
+.export-row .export-label { font-weight: 600; }
+.export-panel select { font: inherit; }
+.export-panel a { margin: 0; }
 
 /* Bookmark marker: a red "*" flagging a bookmarked verse in the reader. A fixed
  * semantic red (not a theme colour), visible on light and dark themes alike. */
diff --git a/internal/web/templates/index.html b/internal/web/templates/index.html
index 3379dc1..b20131d 100644
--- a/internal/web/templates/index.html
+++ b/internal/web/templates/index.html
@@ -32,6 +32,8 @@ function stepDate(n){
 
   <form id="controls" class="controls" hx-get="/readings" hx-target="#pane" hx-trigger="change">
     <div class="controls-main">
+    {{/* The reader entry point is the primary action, so it leads the bar. */}}
+    <a class="nav-link nav-reader" href="/reader">{{.L.NavReader}} &rarr;</a>
     {{/* Always-present marker so the server can tell a form submit with every
          version unchecked (show nothing) from a fresh visit (config default). */}}
     <input type="hidden" name="vset" value="1">
@@ -65,17 +67,35 @@ function stepDate(n){
     </label>
     </div>
 
-    {{/* Utility links, pinned to the top-right (see #controls / .controls-side).
-         The export URLs are built from the live control values at click time. */}}
+    {{/* Utility cluster, pinned to the top-right (see #controls / .controls-side):
+         settings, then a "pobierz" disclosure that opens two download options --
+         a month calendar (its own month/year pickers) and the shown day's
+         readings as txt/md/pdf. Both URLs are built from live values at click
+         time (the readings export from the whole control form, the calendar from
+         its own pickers plus the hidden lectionary field). */}}
     <span class="controls-side">
-      <a class="nav-link nav-reader" href="/reader">{{.L.NavReader}} &rarr;</a>
       <a class="nav-link" href="/settings">{{.L.NavSettings}}</a>
-      <span class="export">{{.L.Export}}:
-        <a href="#" onclick="location='/export?fmt=txt&'+new URLSearchParams(new FormData(document.getElementById('controls'))).toString();return false;">txt</a>
-        <a href="#" onclick="location='/export?fmt=md&'+new URLSearchParams(new FormData(document.getElementById('controls'))).toString();return false;">md</a>
-        <a href="#" onclick="location='/export?fmt=pdf&'+new URLSearchParams(new FormData(document.getElementById('controls'))).toString();return false;">pdf</a>
-        · <a href="#" onclick="var d=(document.querySelector('#controls [name=date]').value||'').slice(0,7);location='/calendar?month='+d+'&lectionary='+document.querySelector('#controls [name=lectionary]').value;return false;">{{.L.Calendar}}</a>
-      </span>
+      <details class="export">
+        <summary class="nav-link">{{.L.Export}}</summary>
+        <div class="export-panel">
+          <div class="export-row">
+            <span class="export-label">{{.L.Calendar}}</span>
+            <select id="cal-month" aria-label="{{.L.Calendar}}">
+              {{range .MonthOpts}}<option value="{{.Val}}"{{if .Sel}} selected{{end}}>{{.Label}}</option>{{end}}
+            </select>
+            <select id="cal-year">
+              {{range .YearOpts}}<option value="{{.Val}}"{{if .Sel}} selected{{end}}>{{.Label}}</option>{{end}}
+            </select>
+            <a href="#" onclick="var m=document.getElementById('cal-month').value,y=document.getElementById('cal-year').value;location='/calendar?month='+y+'-'+('0'+m).slice(-2)+'&lectionary='+document.querySelector('#controls [name=lectionary]').value;return false;">PDF</a>
+          </div>
+          <div class="export-row">
+            <span class="export-label">{{.Date}}</span>
+            <a href="#" onclick="location='/export?fmt=txt&'+new URLSearchParams(new FormData(document.getElementById('controls'))).toString();return false;">txt</a>
+            <a href="#" onclick="location='/export?fmt=md&'+new URLSearchParams(new FormData(document.getElementById('controls'))).toString();return false;">md</a>
+            <a href="#" onclick="location='/export?fmt=pdf&'+new URLSearchParams(new FormData(document.getElementById('controls'))).toString();return false;">pdf</a>
+          </div>
+        </div>
+      </details>
     </span>
   </form>