release: v0.19.0

Release v0.19.0. See the `## [0.19.0] — 2026-09-29` section of
[CHANGELOG.md](https://github.com/ralksta/immich-folio/blob/dev/CHANGELOG.md)
for the full list.

Highlights: client proofing links (#683), custom content pages (#738),
asset picker search (#740), concurrent-edit detection (#742), env-locked
settings (#739), an accessibility baseline (#741), three security fixes
with advisories (#737, #755, #759), and a pre-release quality pass
(#780–#797).

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: ralksta <ralksta@users.noreply.github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
Co-authored-by: Ralf <rohlenbo79@gmail.com>
Co-authored-by: Paul Thies <110185070+ImScheinox@users.noreply.github.com>
Co-authored-by: lancetm714 <108419425+lancetm714@users.noreply.github.com>
Co-authored-by: Lance Martin <lancetaylor95@gmail.com>

lib/config/theme.ts

@@ -130,6 +130,11 @@ function resolveRadius(raw: unknown, fallback: number): number {
  */
 const ACCENT_HEX = /^#([0-9a-f]{3}|[0-9a-f]{6}|[0-9a-f]{8})$/i;
 
+/** Whether `resolveTheme` keeps an accent rather than falling back to the preset's. */
+export function isAccentHex(value: string): boolean {
+  return ACCENT_HEX.test(value.trim());
+}
+
 /** Trim, case-fold and widen to `#rrggbb`; refuse anything that is not hex. */
 function resolveAccent(raw: unknown, fallback: string): string {
   if (typeof raw !== 'string') return fallback;