shortcuts: board arrow-nav, enter→preview→edit, help screen polish, n/a/f/j hotkeys

Board arrow-key card navigation (public/js/app.js):
* ↑/↓/←/→ on the board (body focus, no overlay) move a single-card
  focus cursor (.card-focused, accent2 outline) through the visible
  card grid. Column count is computed live from the first row's
  offsetTop so it tracks the CSS grid columns at any viewport width.
* First arrow press focuses the first card; subsequent presses move
  in the grid. Focused card scrolls into view (smooth, nearest).
* Enter on a focused card → openDetail (preview). Focus cleared.
* Enter in detail view → closeDetail + openModal (editor). Card ref
  is captured before closeDetail nulls state.viewingCard.
* Click anywhere → focus cleared. Re-renders restore focus via
  window._restoreCardFocus() called from board.js renderBoard().

CSS (public/css/style.css):
* .card-focused: accent2 outline + glow, visually distinct from
  .card-selected (accent, multi-select) and .preview-active.
* .shortcut-table kbd keycaps: JetBrains Mono font (not pixel),
  10px, 3D raised look with gradient + bottom border + inner
  highlight + shadow.
* Responsive shortcut grid: 3 cols > 900px, 2 cols > 640px, 1 col.

New bare-key shortcuts (public/js/app.js):
* n → openModal(null) (new card, same as the + button)
* a → activateBucket('all')
* f → activateBucket('favorites')
* j → open today's journal card (find by YYYY-MM-DD prefix in
  state.cards), or create a new one (switch to journal view, open
  empty editor which auto-fills the date title)

Ctrl+N quick capture (public/js/app.js):
* Now sends bucket_id: state.activeBucket on the POST (unless the
  active view is a virtual filter like all/current/etc., in which
  case bucket_id stays null). Cards captured while viewing a user
  bucket land directly in that bucket.

Shortcuts help screen (public/index.php):
* max-w-4xl, 3-column grid layout.
* Complete shortcut inventory across all modules:
  - Navigation: a/f/j/n/t/c/m, 1-9, Tab/Shift+Tab, /
  - Global: Ctrl+K/N/Z, Esc, F1, ?, Del
  - Editor: Ctrl+S, Ctrl+Shift+S, Ctrl+Enter, Tab, Alt+↑↓,
    Shift+Alt+↑↓, Enter (list continue), [[ (link ac), # (tag ac),
    ?snippet
  - Search: ↑↓ navigate, Enter open, Esc close
  - Board+Detail: arrows focus, Enter→preview, Enter→editor,
    ←→ group nav, click/dbl/right/ctrl+click, drag edge/center
  - Canvas: b/e/l/r/o/f/t tool shortcuts, ⌫ delete
  - Mail: ⌫ delete selected, Shift+⌫ skip confirm
* kbd elements use normal font (JetBrains Mono) instead of pixel.
* Help overlay's old shortcuts section replaced with a one-liner
  pointing to ? for the full reference.
* #shortcuts added to runner.js closeAll() list.

chore: bump version to 0.9.12

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

public/js/app.js

@@ -112,8 +112,16 @@ function closeHelp() { helpOverlay?.classList.remove('open'); }
 document.getElementById('help-btn')?.addEventListener('click', openHelp);
 document.getElementById('help-close')?.addEventListener('click', closeHelp);
 helpOverlay?.addEventListener('click', e => { if (e.target === helpOverlay) closeHelp(); });
+
+const shortcutsOverlay = document.getElementById('shortcuts');
+function openShortcuts() { shortcutsOverlay?.classList.add('open'); }
+function closeShortcuts() { shortcutsOverlay?.classList.remove('open'); }
+document.getElementById('shortcuts-btn')?.addEventListener('click', openShortcuts);
+document.getElementById('shortcuts-close')?.addEventListener('click', closeShortcuts);
+shortcutsOverlay?.addEventListener('click', e => { if (e.target === shortcutsOverlay) closeShortcuts(); });
 document.addEventListener('keydown', e => {
     if (e.key === 'F1') { e.preventDefault(); helpOverlay?.classList.contains('open') ? closeHelp() : openHelp(); }
+    if (e.key === '?' && document.activeElement === document.body) { e.preventDefault(); shortcutsOverlay?.classList.contains('open') ? closeShortcuts() : openShortcuts(); }
 });
 
 // ── Export / Import ──
@@ -228,12 +236,48 @@ document.addEventListener('keydown', e => {
         else if (tasks?.classList.contains('open')) closeTasks();
         else if (document.getElementById('gallery')?.classList.contains('open')) closeGallery();
         else if (document.getElementById('calendar')?.classList.contains('open')) closeCalendar();
+        else if (shortcutsOverlay?.classList.contains('open')) closeShortcuts();
         return;
     }
     if (e.key === 's' && (e.ctrlKey || e.metaKey) && modal.classList.contains('open')) { e.preventDefault(); e.shiftKey ? saveCard() : saveOnly(); return; }
     if (e.key === 'Enter' && (e.ctrlKey || e.metaKey) && modal.classList.contains('open')) { e.preventDefault(); saveCard(); return; }
     if (e.key === 'z' && (e.ctrlKey || e.metaKey) && !modal.classList.contains('open') && canUndo()) { e.preventDefault(); undo(); return; }
     if (e.key === '/' && ![modal, detail, search, tasks].some(el => el?.classList.contains('open')) && document.activeElement === document.body) { e.preventDefault(); openSearch(); }
+    // Bare "n" → open editor for a new card (same as clicking the + button).
+    if (e.key === 'n' && !e.ctrlKey && !e.metaKey && !e.altKey && !e.shiftKey && document.activeElement === document.body) {
+        const blockers = [modal, detail, search, tasks, document.getElementById('gallery'), document.getElementById('settings-overlay'), document.getElementById('help'), document.getElementById('email-overlay'), document.getElementById('calendar'), document.getElementById('shortcuts')];
+        if (blockers.some(el => el?.classList.contains('open'))) return;
+        e.preventDefault();
+        openModal(null);
+        return;
+    }
+    // Bare "a" → bucket all, "f" → bucket favorites. Same guards as the
+    // other bare-key shortcuts.
+    if ((e.key === 'a' || e.key === 'f') && !e.ctrlKey && !e.metaKey && !e.altKey && !e.shiftKey && document.activeElement === document.body) {
+        const blockers = [modal, detail, search, tasks, document.getElementById('gallery'), document.getElementById('settings-overlay'), document.getElementById('help'), document.getElementById('email-overlay'), document.getElementById('calendar')];
+        if (blockers.some(el => el?.classList.contains('open'))) return;
+        e.preventDefault();
+        activateBucket(e.key === 'a' ? 'all' : 'favorites');
+        return;
+    }
+    // Bare "j" → open today's journal card (or create one if it doesn't
+    // exist). Journal cards have a YYYY-MM-DD title prefix.
+    if (e.key === 'j' && !e.ctrlKey && !e.metaKey && !e.altKey && !e.shiftKey && document.activeElement === document.body) {
+        const blockers = [modal, detail, search, tasks, document.getElementById('gallery'), document.getElementById('settings-overlay'), document.getElementById('help'), document.getElementById('email-overlay'), document.getElementById('calendar')];
+        if (blockers.some(el => el?.classList.contains('open'))) return;
+        e.preventDefault();
+        const today = new Date().toISOString().substring(0, 10);
+        const existing = state.cards.find(c => (c.title || '').startsWith(today));
+        if (existing) {
+            openModal(existing);
+        } else {
+            // Switch to journal view so openModal picks up the journal
+            // context (auto-fills the date title).
+            activateBucket('journal');
+            openModal(null);
+        }
+        return;
+    }
     // Bare "c" toggles the calendar from the board. Same guards as "/":
     // no modifier, focus on <body> (so it doesn't intercept text typing),
     // and no full-screen overlay already in front.
@@ -255,6 +299,36 @@ document.addEventListener('keydown', e => {
         openTagQuickPick();
         return;
     }
+    // Tab / Shift+Tab cycles through ALL bucket tiles in bar order
+    // (specials + user buckets + super-buckets). Wraps around at both
+    // ends. Same focus + overlay guards as the other bare-key shortcuts.
+    if (e.key === 'Tab' && !e.ctrlKey && !e.metaKey && !e.altKey && document.activeElement === document.body) {
+        const blockers = [modal, detail, search, tasks, document.getElementById('gallery'), document.getElementById('settings-overlay'), document.getElementById('help'), document.getElementById('email-overlay'), document.getElementById('calendar')];
+        if (blockers.some(el => el?.classList.contains('open'))) return;
+        const tiles = [...document.querySelectorAll('#bucket-bar .bucket-tab[data-bucket], #bucket-bar .bucket-tab[data-bucket-super]')];
+        if (!tiles.length) return;
+        // Find which tile is currently active
+        const curIdx = tiles.findIndex(t => {
+            const bid = t.dataset.bucket || t.dataset.bucketSuper;
+            if (bid == state.activeBucket) return true;
+            // Super-bucket: active if any child matches
+            if (t.dataset.bucketSuper) {
+                return state.buckets.some(b => b.parent_id == t.dataset.bucketSuper && b.id == state.activeBucket);
+            }
+            return false;
+        });
+        const dir = e.shiftKey ? -1 : 1;
+        const nextIdx = (curIdx + dir + tiles.length) % tiles.length;
+        const next = tiles[nextIdx];
+        if (next) {
+            e.preventDefault();
+            const target = next.dataset.bucketSuper
+                ? (next.dataset.superShown || next.dataset.bucketSuper)
+                : next.dataset.bucket;
+            activateBucket(target);
+        }
+        return;
+    }
     // Bare "1"–"9" picks the Nth user bucket in the bar — fixed filters
     // (all/current/favorites/journal/none) are skipped, super-buckets
     // count as one slot and activate via activateBucket() so the
@@ -287,8 +361,93 @@ document.addEventListener('keydown', e => {
         e.preventDefault();
         showDetailCard((e.key === 'ArrowRight' ? gc[(idx + 1) % gc.length] : gc[(idx - 1 + gc.length) % gc.length]).id);
     }
+
+    // Enter in detail view → close preview, then open editor
+    if (e.key === 'Enter' && !e.ctrlKey && !e.metaKey && detail.classList.contains('open') && state.viewingCard) {
+        e.preventDefault();
+        const card = state.viewingCard;
+        closeDetail();
+        openModal(card);
+        return;
+    }
+
+    // ── Board arrow-key card navigation ──
+    // Arrow keys select a card on the board (different from Ctrl+click
+    // multi-select — this is a single-focus cursor). Enter on a focused
+    // card opens the detail view. Escape clears the focus. The focus
+    // indicator is a `.card-focused` outline (accent2, distinct from the
+    // multi-select accent outline).
+    const isArrow = ['ArrowUp', 'ArrowDown', 'ArrowLeft', 'ArrowRight'].includes(e.key);
+    if ((isArrow || e.key === 'Enter') && document.activeElement === document.body) {
+        const blockers = [modal, detail, search, tasks, document.getElementById('gallery'), document.getElementById('settings-overlay'), document.getElementById('help'), document.getElementById('email-overlay'), document.getElementById('calendar'), document.getElementById('shortcuts')];
+        if (blockers.some(el => el?.classList.contains('open'))) return;
+
+        const board = document.getElementById('board');
+        if (!board) return;
+        const cards = [...board.querySelectorAll('.board-card[data-id]')];
+        if (!cards.length) return;
+
+        if (e.key === 'Enter') {
+            const focused = board.querySelector('.card-focused');
+            if (focused) {
+                e.preventDefault();
+                window._openDetail(focused.dataset.id);
+                clearCardFocus();
+            }
+            return;
+        }
+
+        e.preventDefault();
+        const focused = board.querySelector('.card-focused');
+        let curIdx = focused ? cards.indexOf(focused) : -1;
+
+        if (curIdx < 0) {
+            // No focus yet → select the first card
+            setCardFocus(cards[0]);
+            return;
+        }
+
+        // Compute columns per row from the grid layout
+        const firstTop = cards[0].offsetTop;
+        let cols = cards.length;
+        for (let i = 1; i < cards.length; i++) {
+            if (cards[i].offsetTop !== firstTop) { cols = i; break; }
+        }
+
+        let next = curIdx;
+        if (e.key === 'ArrowRight') next = Math.min(curIdx + 1, cards.length - 1);
+        else if (e.key === 'ArrowLeft') next = Math.max(curIdx - 1, 0);
+        else if (e.key === 'ArrowDown') next = Math.min(curIdx + cols, cards.length - 1);
+        else if (e.key === 'ArrowUp') next = Math.max(curIdx - cols, 0);
+
+        if (next !== curIdx) setCardFocus(cards[next]);
+    }
 });
 
+let focusedCardId = null;
+function setCardFocus(el) {
+    clearCardFocus();
+    if (!el) return;
+    el.classList.add('card-focused');
+    focusedCardId = el.dataset.id;
+    el.scrollIntoView({ block: 'nearest', behavior: 'smooth' });
+}
+function clearCardFocus() {
+    document.querySelectorAll('.card-focused').forEach(c => c.classList.remove('card-focused'));
+    focusedCardId = null;
+}
+// Clear focus when clicking anywhere on the board (a card click opens
+// detail/editor and focus is no longer meaningful), or when any overlay
+// opens. Also re-apply after a board re-render if the focused card is
+// still in the DOM.
+document.addEventListener('click', () => { if (focusedCardId) clearCardFocus(); });
+window._restoreCardFocus = function () {
+    if (!focusedCardId) return;
+    const el = document.querySelector(`#board .board-card[data-id="${focusedCardId}"]`);
+    if (el) el.classList.add('card-focused');
+    else clearCardFocus();
+};
+
 // ── Quick Capture ──
 
 document.getElementById('quick-capture-input')?.addEventListener('keydown', async e => {
@@ -318,7 +477,12 @@ document.getElementById('quick-capture-input')?.addEventListener('keydown', asyn
     if (!cardTitle) return;
     if (!body.includes('#inbox')) body = (body ? body + '\n\n' : '') + '#inbox';
 
-    await api('api/cards', { method: 'POST', body: { title: cardTitle, body, color: '#38bdf8', position: -1 } });
+    // Place the card in the currently active bucket (if it's a real
+    // user bucket). Special filters (all/current/favorites/journal/none)
+    // don't map to a bucket_id — cards captured there stay unsorted.
+    const VIRTUAL = ['all', 'current', 'favorites', 'journal', 'none'];
+    const bucketId = VIRTUAL.includes(state.activeBucket) ? null : state.activeBucket;
+    await api('api/cards', { method: 'POST', body: { title: cardTitle, body, color: '#38bdf8', position: -1, bucket_id: bucketId } });
 
     e.target.value = '';
     document.getElementById('quick-capture').classList.add('hidden');