Box the download settings instead of hanging them from a rule (#167)

Asked for after the redesign: the switch and what depends on it sit in one box with rounded
corners, in place of the rule down their left side. Drawn in --line rather than --edge, so it shows
on a phone too, where --edge draws no outlines; the indent the rule needed goes with it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/dialogs.ts

@@ -505,7 +505,7 @@ function settingsModal(f, newUrl?: string){
       <div class="inline"><input type="text" id="surl" value="${esc(newUrl||f.url)}" spellcheck="false"${admin?'':' readonly'}>
         <button type="button" class="btn ico" id="scopy" title="Copy the address" aria-label="Copy the address">${ICON.copy}</button></div>
       ${newUrl?'<p class="moved">The feed says it has moved here. Save to follow it.</p>':''}</div>
-    ${sw(`<input type="checkbox" role="switch" id="sauto"${f.auto_download?' checked':''}>`,'Download automatically',' lead')}
+    <div class="fdl">${sw(`<input type="checkbox" role="switch" id="sauto"${f.auto_download?' checked':''}>`,'Download automatically',' lead')}
     <div class="fdeps${f.auto_download?'':' off'}" id="sdeps"><div><div class="fdepsin">
       <div class="tabs seg" role="radiogroup" aria-label="How many to download">${
         [['default',`Default (${globalMax||'all'})`],['newest','Newest'],['all','All']].map(([v,t])=>
@@ -516,7 +516,7 @@ function settingsModal(f, newUrl?: string){
         <div class="chips" id="skw">${chipsHTML(f.keywords,'skwin')}</div>
         <p class="cap">Any one of these will do, and a phrase needs all its words. Empty takes everything.</p></div>
       ${sw(`<input type="checkbox" role="switch" id="sexp"${f.allow_explicit?' checked':''}>`,'Include explicit items')}
-    </div></div></div>
+    </div></div></div></div>
     ${isGroup?'':`<div class="ffield"><label class="flabel" for="sblockin">Hide items that mention</label>
       <div class="chips" id="sblock">${chipsHTML(f.blocked||[],'sblockin')}</div>
       <p class="cap">Whole words or phrases. Hidden from your list and not downloaded for you, along