Add rules edition setting for condition tooltips (5e/5.5e)

Introduce a settings modal (opened from the kebab menu) with a rules
edition selector for condition tooltip descriptions and a theme picker
replacing the inline cycle button. About half the conditions have
meaningful mechanical differences between editions.

- Add description5e field to ConditionDefinition with 5e (2014) text
- Add RulesEditionProvider context with localStorage persistence
- Create SettingsModal with Conditions and Theme sections
- Wire condition tooltips to edition-aware descriptions
- Fix 6 inaccurate 5.5e condition descriptions
- Update spec 003 with stories CC-3, CC-8 and FR-095–FR-102

Closes #12

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/web/src/hooks/use-theme.ts

@@ -71,8 +71,6 @@ function getSnapshot(): ThemePreference {
 	return currentPreference;
 }
 
-const CYCLE: ThemePreference[] = ["system", "light", "dark"];
-
 export function useTheme() {
 	const preference = useSyncExternalStore(subscribe, getSnapshot);
 	const resolved = resolve(preference);
@@ -88,11 +86,5 @@ export function useTheme() {
 		notifyAll();
 	}, []);
 
-	const cycleTheme = useCallback(() => {
-		const idx = CYCLE.indexOf(currentPreference);
-		const next = CYCLE[(idx + 1) % CYCLE.length];
-		setPreference(next);
-	}, [setPreference]);
-
-	return { preference, resolved, setPreference, cycleTheme } as const;
+	return { preference, resolved, setPreference } as const;
 }