Make the app work better on iPhone and iPad

- Text fields are at least 16px on touch screens (stops iOS zooming on focus)
- Chapter swipe ignores sheets, fields, sliders, sideways-scrolling rows and text selection
- vh -> dvh for sheets, palette and dialogs
- Bigger tap targets for small links, chips and the logo; no double-tap delay
- No tap flash or landscape text inflation

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

src/pages/SetupPage.jsx

@@ -113,7 +113,7 @@ export default function SetupPage() {
                   </div>
                   <input type="text" value={b.verseSearch} onChange={(e) => b.setVerseSearch(e.target.value)} placeholder="Search verses in this chapter…"
                     className="mb-3 w-full rounded-xl border border-[var(--r-line)] bg-[var(--r-bg)] px-3 py-2 text-sm text-[var(--r-text)] focus:outline-none focus:ring-2 focus:ring-[var(--r-line)]" />
-                  <div data-testid="verse-list" className="max-h-[68vh] overflow-y-auto rounded-xl bg-[var(--r-bg)] px-3 py-3 font-serif text-[1.02rem] leading-[1.8]">
+                  <div data-testid="verse-list" className="max-h-[68dvh] overflow-y-auto rounded-xl bg-[var(--r-bg)] px-3 py-3 font-serif text-[1.02rem] leading-[1.8]">
                     {activeChapter.verses
                       .filter((v) => v.text.toLowerCase().includes(b.verseSearch.trim().toLowerCase()))
                       .map((verse) => {
@@ -181,7 +181,7 @@ export default function SetupPage() {
                       <button type="button" onClick={() => b.splitAfterVerse(lastVerse)} className={smallBtn} title="Make one chunk from the last chunk to the end of the chapter">Chunk the rest</button>
                     )}
                   </div>
-                  <div className="max-h-[42vh] space-y-2 overflow-y-auto">
+                  <div className="max-h-[42dvh] space-y-2 overflow-y-auto">
                     {activeChapter.chunks.length === 0 ? (
                       <p className="rounded-xl border border-dashed border-[var(--r-line)] p-3 text-sm text-[var(--r-sub)]">No chunks yet. Click between verses, or suggest them from the headings.</p>
                     ) : activeChapter.chunks.map((chunk, index) => (