Add PDF file attachments to components

- Upload PDFs, rename them (conflict-checked), delete them
- Link/unlink files per component (many components can share a file)
- File picker dialog: browse existing files, rename inline, upload new
- Component detail shows linked files as clickable links
- Files stored in data/pdfs/, served at /pdf/:filename
- KV prefix: pdf:

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

public/style.css

@@ -1506,3 +1506,78 @@ nav {
 	padding: 0.25rem 0.6rem;
 	font-size: 0.82rem;
 }
+
+/* ===== FILE PICKER DIALOG ===== */
+
+.fp-list {
+	display: flex;
+	flex-direction: column;
+	gap: 0.3rem;
+	max-height: 40vh;
+	overflow-y: auto;
+	margin-bottom: 1rem;
+}
+
+.fp-row {
+	display: flex;
+	align-items: center;
+	gap: 0.5rem;
+	padding: 0.35rem 0.5rem;
+	border-radius: 4px;
+	background: var(--surface-raised);
+}
+
+.fp-name {
+	flex: 1;
+	font-size: 0.9rem;
+	overflow: hidden;
+	text-overflow: ellipsis;
+	white-space: nowrap;
+}
+
+.fp-rename-input {
+	flex: 1;
+	font-size: 0.9rem;
+	background: var(--bg);
+	color: var(--text);
+	border: 1px solid var(--border-focus);
+	border-radius: 4px;
+	padding: 0.2rem 0.4rem;
+}
+
+.fp-upload-section {
+	border-top: 1px solid var(--border);
+	padding-top: 1rem;
+	margin-top: 0.25rem;
+}
+
+.fp-upload-row {
+	display: flex;
+	gap: 0.5rem;
+	align-items: center;
+	flex-wrap: wrap;
+}
+
+.fp-upload-row input[type=text] {
+	flex: 1;
+	min-width: 140px;
+}
+
+/* ===== DETAIL FILE LINKS ===== */
+
+.detail-files-list {
+	display: flex;
+	flex-direction: column;
+	gap: 0.3rem;
+}
+
+.detail-file-link {
+	color: var(--accent);
+	text-decoration: none;
+	font-size: 0.9rem;
+	padding: 0.2rem 0;
+}
+
+.detail-file-link:hover {
+	text-decoration: underline;
+}