web: horizontal/vertical/interlinear display modes + web_display config

Adds a display-layout option to lectio-web alongside the existing colour
themes:

- config: WebDisplay field (toml web_display), default "horizontal",
  normalized on load via the new exported config.NormalizeDisplay
  (unknown -> "horizontal", same lenient style as the other web_* fields).
- render: extracts the citation/ToEnglishRef resolution shared by
  GatherVersion into an unexported resolveRef helper (GatherVersion's
  signature/behavior unchanged) and adds GatherVerses(version, sec,
  lectionary) returning raw bible.Verse structs plus a versified flag, for
  column/interlinear alignment.
- web/render: RenderReadings gains a display parameter. "horizontal" is
  the original stacked layout, byte-for-byte the same code path as
  before. "vertical" reuses the same per-version column data in a
  .display-vertical/.vcol grid (the CLI compare view, browser-side).
  "interlinear" maps versions through render.OfflineVersions' pl->wuj
  substitution (pl has no verse numbers), gathers GatherVerses per
  version, and interleaves them by chapter:verse into .ilverse/.illine
  blocks (ordered union of keys, first versified version's order first).
- server: adds a display <select> to the top bar wired into the existing
  #controls HTMX form; a resolveQuery(cfg, r) helper replaces the
  duplicated date/lectionary/all/versions(+now display) resolution in
  indexHandler and readingsHandler.
- fold-in from the B2 review: indexHandler now populates indexData.Lookup
  via a shared renderLookup(ref, versions) helper (also used by
  lookupHandler), so a bookmarked "/?ref=...&v=..." link shows its
  lookup result instead of an empty pane.
- base.css: layout-only rules for the two new modes (no colours; themes
  stay colour-only).

go test ./..., go vet ./..., gofmt clean; go build ./cmd/lectio-web ok.

1 files changed, 13 insertions, 3 deletions

diff --git a/internal/web/templates/index.html b/internal/web/templates/index.html
index 4dd580f..03c0078 100644
--- a/internal/web/templates/index.html
+++ b/internal/web/templates/index.html
@@ -1,11 +1,13 @@
 {{/* index.html renders the full lectio-web page: top-bar controls (date,
-     lectionary, version checkboxes, all/gospel toggle, theme select), a
-     passage-lookup form, and the pre-rendered reading pane (#pane).
+     lectionary, version checkboxes, all/gospel toggle, display select,
+     theme select), a passage-lookup form, and the pre-rendered reading pane
+     (#pane).
 
      The controls form (#controls) carries hx-get="/readings" and fires on
      any "change" bubbling up from its fields (htmx auto-includes an
      hx-get element's enclosing form fields as the request's query
-     params -- no hx-include needed). The date +/- buttons are separate
+     params -- no hx-include needed), so "display" needs no extra wiring
+     beyond living inside #controls. The date +/- buttons are separate
      hx-get elements nested in the same form so their own field values are
      included too; they override "date" via hx-vals. The theme <select>
      has no server round trip: it swaps the #theme <link>'s href directly. */}}
@@ -48,6 +50,14 @@
         <option value="1" {{if .All}}selected{{end}}>wszystkie części</option>
       </select>
     </label>
+
+    <label>układ
+      <select name="display">
+        <option value="horizontal" {{if eq .Display "horizontal"}}selected{{end}}>poziomo</option>
+        <option value="vertical" {{if eq .Display "vertical"}}selected{{end}}>kolumny</option>
+        <option value="interlinear" {{if eq .Display "interlinear"}}selected{{end}}>interlinearnie</option>
+      </select>
+    </label>
   </form>
 
   <label class="theme-picker">motyw