Admin: validate raw emoji input instead of trimming it

The backend rejects whitespace in emoji keys, so an entry like " 🐶 "
must fail the picker's validation rather than be saved as emoji:🐶.
Only an exactly empty field clears the icon; whitespace-only text now
shows the invalid-emoji error.

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

admin/src/definitions/DefinitionsTab.test.tsx

@@ -1282,10 +1282,9 @@ describe("DefinitionsTab Font Awesome and emoji icons", () => {
 
   it("builds and validates emoji keys like the registry", () => {
     expect(emojiIconKey("🐶")).toBe("emoji:🐶");
-    expect(emojiIconKey(" 🐶 ")).toBe("emoji:🐶");
     expect(emojiIconKey("👨‍👩‍👧‍👦")).toBe("emoji:👨‍👩‍👧‍👦");
     expect(emojiIconKey("⭐".repeat(8))).toBe(`emoji:${"⭐".repeat(8)}`);
-    for (const bad of ["", "   ", "⭐".repeat(9), "a b", "<b>", "a&b", "🐶\u0007"]) {
+    for (const bad of ["", "   ", " 🐶 ", "🐶 ", "\t🐶", "⭐".repeat(9), "a b", "<b>", "a&b", "🐶\u0007"]) {
       expect(emojiIconKey(bad), JSON.stringify(bad)).toBeNull();
     }
     expect(faIconName("fa:dog")).toBe("dog");
@@ -1335,7 +1334,7 @@ describe("DefinitionsTab Font Awesome and emoji icons", () => {
     fireEvent.click(screen.getByRole("button", { name: "New" }));
     const s = sheet();
     fillNewTask(s);
-    fireEvent.change(emojiInput(s), { target: { value: " 🐶 " } });
+    fireEvent.change(emojiInput(s), { target: { value: "🐶" } });
     expect(radio(s, "Icon", "No icon").getAttribute("aria-checked")).toBe("false");
 
     await save(s);
@@ -1358,7 +1357,7 @@ describe("DefinitionsTab Font Awesome and emoji icons", () => {
     expect(rowGlyph(await screen.findByTestId("definition-99"))).toBe("lucide:dog");
   });
 
-  for (const bad of ["a b", "<b>", "a&b", "⭐".repeat(9)]) {
+  for (const bad of [" 🐶 ", "🐶 ", "   ", "a b", "<b>", "a&b", "⭐".repeat(9)]) {
     it(`an invalid emoji entry ${JSON.stringify(bad)} is not saved`, async () => {
       await renderReady([{ ...BRUSH, id: 50, icon: "lucide:dog" }]);
       fireEvent.click(screen.getByTestId("definition-50"));

admin/src/definitions/DefinitionsTab.tsx

@@ -249,7 +249,7 @@ function buildBody(draft: Draft, keepsAssignees = false): DefinitionCreateBody |
   if (!title) return "Give the task a title.";
   if (draft.assigneeIds.length === 0 && !keepsAssignees) return "Assign at least one child.";
   if (draft.windows.length === 0) return "Pick at least one window.";
-  if (draft.emoji.trim() && draft.icon === null) {
+  if (draft.emoji && draft.icon === null) {
     return "Enter a single emoji (no spaces or < > &), or clear the emoji field.";
   }
   const rule = buildRule(draft);
@@ -590,10 +590,10 @@ function EditSheet({
               <button
                 type="button"
                 role="radio"
-                aria-checked={draft.icon === null && !draft.emoji.trim()}
+                aria-checked={draft.icon === null && !draft.emoji}
                 aria-label="No icon"
                 className={
-                  draft.icon === null && !draft.emoji.trim() ? "defs-icon defs-icon--on" : "defs-icon"
+                  draft.icon === null && !draft.emoji ? "defs-icon defs-icon--on" : "defs-icon"
                 }
                 onClick={() => update({ icon: null, emoji: "" })}
               >

admin/src/definitions/definitionIcons.tsx

@@ -32,12 +32,13 @@ export function faIconKey(name: string): string {
 }
 
 /**
- * The stored key for typed emoji text, e.g. `emoji:🐶`. Edge whitespace is
- * trimmed; the rest must pass the registry's emoji check (1-8 code points,
- * no whitespace, control characters or `<`, `>`, `&`), else null.
+ * The stored key for typed emoji text, e.g. `emoji:🐶`. The raw text — not
+ * trimmed, as the backend rejects any whitespace — must pass the registry's
+ * emoji check (1-8 code points, no whitespace, control characters or `<`,
+ * `>`, `&`), else null. Only an empty field means "no icon".
  */
 export function emojiIconKey(text: string): string | null {
-  const key = `${EMOJI_PREFIX}${text.trim()}`;
+  const key = `${EMOJI_PREFIX}${text}`;
   return resolveIcon(key).kind === "emoji" ? key : null;
 }