feat(theme): bump accent chroma, push sensory zones apart, richer status tokens

Phase 10b colour push: theme reads as Magnotia, not "subdued generic dark".
Same lightness band as Phase 10a (AA preserved), more chroma across accent,
status tokens, and zone surfaces.

Dark accent: #c98555 -> #d68450 (subtle/hover/glow recomputed).
Light accent: #a06a3e -> #a3683a.
Dark status: success #7ec89a -> #5fc28a, danger #e87171 -> #e85f5f,
warning #e8c86e -> #e8be4a.
Light status: success #2f7549 -> #1f7344, danger #a83838 -> #b32626,
warning #b89a3e -> #a08a1f.

Sensory zones pushed further apart so each zone reads as its own
environment: cave cools toward blue-grey, energy warms toward red-orange,
reset cools toward green. AA on body text verified for every Card surface
in both themes.

Stale accent rgba (201,133,85) replaced with new (214,132,80) across nine
files. --shadow-accent in colors_and_type.css mirrored.

No secondary tint token added: Magnotia's identity is amber-as-the-only-
meaningful-colour. Cheaper to add a second meaningful colour later if a
real need appears than to dilute the discipline now.

Default surfaces, text tokens, and borders untouched per scope.

src/lib/components/HotkeyRecorder.svelte

@@ -187,7 +187,7 @@
     type="button"
     class="inline-flex items-center gap-1.5 rounded-xl px-4 py-2.5
       {recording
-        ? 'bg-bg-input border-accent shadow-[0_0_0_3px_rgba(201,133,85,0.1)]'
+        ? 'bg-bg-input border-accent shadow-[0_0_0_3px_rgba(214,132,80,0.1)]'
         : captured
           ? 'bg-success/10 border-success/40'
           : 'bg-bg-input border-border hover:border-border'}