Auto-growing name box for the new-project tile

Replace the plain <input> with a rows=1 <textarea> that grows to fit
its content on input, so a long or wrapped name stays fully visible
instead of scrolling. Enter still submits rather than adding a
newline, and the box resets to one row after a successful create.

Also make the tile's background transparent (dashed border stays) and
drop its 'Create a project' title, keeping just the Name field --
accessible label moved to aria-label since the placeholder now stands
alone.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

web/src/style.css

@@ -361,6 +361,7 @@ h1 {
 }
 
 .project-card--new {
+  background: transparent;
   border-style: dashed;
 }
 
@@ -370,13 +371,20 @@ h1 {
   font-size: 0.9rem;
 }
 
-.project-card--new input {
+.project-card__name-input {
+  display: block;
+  width: 100%;
+  box-sizing: border-box;
   padding: 0.55rem 0.7rem;
   border: 1px solid var(--border);
   border-radius: 8px;
   background: var(--bg);
   color: var(--text);
+  font: inherit;
   font-size: 1rem;
+  /* Grown in JS to fit its content -- no manual resize handle, no scrollbar. */
+  resize: none;
+  overflow: hidden;
 }
 
 /* --- project detail: cards ------------------------------------------ */