refactor(styles): split components.css into per-section files (#657)

components.css (14205 LOC) → 84 per-section files in src/styles/components/ +
an index.css that imports them in original cascade order.

Same approach as the theme.css split: top-level sections are detected by
single-dash or 3+ dash header decoration (/^\/\* ─(?: |─{2,})/), 2-dash
sub-sections stay inside their parent. Concatenating in @import order
reproduces the original byte stream (+1 trailing newline, cosmetic).

Each section is now self-contained — touching Tracklist, Modal, Hero,
Sidebar, etc. only opens one focused file.

Generated via /tmp/split-components-css.mjs.

src/styles/components/playlists-overview-header.css

@@ -0,0 +1,10 @@
+/* ─ Playlists overview header ─ */
+.playlists-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: var(--space-4);
+  flex-wrap: wrap;
+  margin-bottom: var(--space-6);
+}
+