style(breakpoints): consolidate 9 ad-hoc values into 5 SCSS tokens

Adds src/styles/_breakpoints.scss with five canonical tokens
(\$bp-sm 600, \$bp-md 800, \$bp-lg 1024, \$bp-xl 1280, \$bp-2xl 1600)
and migrates all 15 @media (max-width: ...) occurrences across 9 files.
Configures vite.config.ts with scss loadPaths so any file can
@use "breakpoints" without relative paths.

Conservative rounding-up where existing values were near-duplicates:
500 and 512 collapse to 600, 768 collapses to 800, 1000 collapses to
1024. Slightly more viewports get the smaller-layout treatment in
those bands, which is usually beneficial on cramped widths.

Converts 7 Svelte files from <style> to <style lang="scss"> to access
the SCSS tokens. SCSS is a CSS superset, so existing rules stay valid.

1 files changed, 5 insertions, 3 deletions

diff --git a/src/lib/Schedule/Days.svelte b/src/lib/Schedule/Days.svelte
index ec36be5c..9ecf76b9 100644
--- a/src/lib/Schedule/Days.svelte
+++ b/src/lib/Schedule/Days.svelte
@@ -218,7 +218,9 @@ const episode = (media: Media, weekday: string) => {
   <RateLimitedError type="Media lists" loginSessionError={false} card list={false} />
 {/await}
 
-<style>
+<style lang="scss">
+  @use "breakpoints" as *;
+
   .countdown {
     white-space: nowrap;
     float: right;
@@ -237,7 +239,7 @@ const episode = (media: Media, weekday: string) => {
     page-break-inside: avoid;
   }
 
-  @media (max-width: 800px) {
+  @media (max-width: $bp-md) {
     .cover-title-element {
       display: none;
     }
@@ -247,7 +249,7 @@ const episode = (media: Media, weekday: string) => {
     }
   }
 
-  @media (max-width: 1600px) {
+  @media (max-width: $bp-2xl) {
     .cover-title-element {
       display: none;
     }