fix(reader): stop page-turn and zoom shortcuts while typing in form fields

handleKeydown computed a 'typing' guard for the event target but only
applied it to the drawer-shortcut block (t/s/b/?//). The vi-style page
turns (h/l), arrows, and zoom keys (+/−/0) fired regardless, so typing
into the note textarea hijacked the keys: 'Wh' turned back a page on the
h, arrows moved pages instead of the caret, and digits/minus zoomed.

Return early for INPUT/SELECT/TEXTAREA/contentEditable targets, keeping
Escape live so popovers and drawers stay dismissable from the keyboard
mid-note. Covers the selection-popover note field, the notes drawer
textarea, bookmark rename, and the search box. The now-unreachable
'!typing' condition on the shortcut block is dropped.

web/src/reader/reader.ts

@@ -2493,11 +2493,18 @@ document.addEventListener("alpine:init", () => {
     },
     handleKeydown(event: KeyboardEvent) {
       const k = event.key;
-      // Never hijack keys while the user is typing in a form control.
-      const tag = (event.target as HTMLElement)?.tagName;
+      // Never hijack keys while the user is typing in a form control: the
+      // field must receive h/l page turns, +/− zoom, and caret arrows.
+      // Escape stays live so popovers/drawers can still be dismissed from
+      // the keyboard even mid-note.
+      const t = event.target as HTMLElement | null;
       const typing =
-        tag === "INPUT" || tag === "SELECT" || tag === "TEXTAREA";
+        t?.tagName === "INPUT" ||
+        t?.tagName === "SELECT" ||
+        t?.tagName === "TEXTAREA" ||
+        !!t?.isContentEditable;
       this.pokeChrome();
+      if (typing && k !== "Escape") return;
       if (k === "ArrowLeft" || k === "h") {
         if (event.altKey) {
           event.preventDefault();
@@ -2526,7 +2533,7 @@ document.addEventListener("alpine:init", () => {
       } else if (k === "F1") {
         event.preventDefault();
         this.toggleHelp();
-      } else if (!typing) {
+      } else {
         if (k === "t") this.toggleTOC();
         else if (k === "s") this.toggleSettings();
         else if (k === "b") this.addBookmark();