agent: lumotia-rebrand — frontend strings (svelte + i18n + design-system)

Phase 8 of the rebrand cascade. Every rendered string is now Lumotia;
no Magnotia surface visible in the UI.

Sweep replaced \bmagnotia\b -> lumotia and \bMagnotia\b -> Lumotia
across all .svelte / .ts / .js / .css / .html / .json (excluding
package-lock.json which regenerates, target/, build/, node_modules/).

Surfaces touched:
- src/app.css — design-token comment header and .magnotia-rh-* CSS
  resize-handle class selectors (also the consuming elements in
  components/ResizeHandles.svelte and src/routes/*/+layout.svelte).
- src/lib/i18n/locales/{en,de,es}.json — brand name in translations.
- src/lib/i18n/index.ts — header comment.
- src/lib/Sidebar.svelte and most pages under src/lib/pages/ +
  src/lib/components/ — title bars, document titles, default
  filenames (lumotia-YYYY-MM-DD.* etc), toast strings, error
  messages, dialog headers.
- src/routes/+layout.svelte, +page.svelte, viewer/, float/, preview/.
- src/app.html page <title>.
- src/lib/utils/settingsMigrations.ts — fallback toast copy.
- src/design-system/{colors_and_type.css,SKILL.md,README.md,
  ui_kits/{Sidebar.jsx,index.html}} — design-tokens, doc strings,
  preview wordmark in the kit.
- package.json — name + description.

NOT touched (deferred / immutable):
- package-lock.json — regenerates on next npm install.
- The two migration-call sites in stores reference the legacy magnotia
  keys deliberately; restored after the sweep clobbered them.
- docs/, README.md, HANDOVER.md — Phase 9 scope.

npm run check: 0 errors / 0 warnings (3958 files).
cargo test --workspace: 339 pass / 0 fail.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/lib/utils/frontmatter.ts

@@ -43,7 +43,7 @@ function timeOfDayTag(dateStr: string): string | null {
   if (!dateStr) return null;
   let ts = Date.parse(dateStr);
   if (Number.isNaN(ts)) {
-    // Try DD/MM/YYYY, HH:MM:SS (UK local format used by Magnotia history rows).
+    // Try DD/MM/YYYY, HH:MM:SS (UK local format used by Lumotia history rows).
     const match = String(dateStr).match(
       /(\d{1,2})\/(\d{1,2})\/(\d{4})[,\s]+(\d{1,2}):(\d{2})(?::(\d{2}))?/,
     );
@@ -75,7 +75,7 @@ function sourceTag(source: string): string | null {
 // already shown elsewhere in the History row, so chips would duplicate
 // information and add cognitive load without improving retrieval. The
 // function is kept as a hook for one future AI-derived content tag
-// (`topic:*`) once magnotia-llm wires up real llama-cpp-2 in Phase 3.
+// (`topic:*`) once lumotia-llm wires up real llama-cpp-2 in Phase 3.
 export function deriveAutoTags(_item: TranscriptEntry): string[] {
   return [];
 }