Refonte design : 4 humeurs, onboarding, sections avec boite a outils

- Systeme de themes adaptatifs : Peps (light chaud), Zen (light calme),
  Chagrine (dark violet), Grave (dark ambre) avec CSS custom properties
- Dashboard d'accueil orienté onboarding avec cartes-portes et teaser
  boite a outils
- SectionLayout reutilisable : liste + sidebar toolbox + status pills
  cliquables (En prepa / En vote / En vigueur / Clos)
- ToolboxVignette : vignettes Contexte / Tutos / Choisir / Demarrer
- Seed : Acte engagement certification + forgeron, Runtime Upgrade
  (decision on-chain), 3 modalites de vote (majoritaire, quadratique,
  permanent)
- Backend adapte SQLite (Uuid portable, 204 fix, pool conditionnel)
- Correction noms composants (pathPrefix: false), pinia/nuxt ^0.11

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/app/components/documents/ItemVersionDiff.vue

@@ -35,7 +35,7 @@ function truncateAddress(address: string | null): string {
       <!-- Header -->
       <div class="flex items-start justify-between">
         <div class="flex items-center gap-3">
-          <CommonStatusBadge :status="version.status" type="version" />
+          <StatusBadge :status="version.status" type="version" />
           <span class="text-sm text-gray-500">
             Propose par
             <span class="font-medium text-gray-700 dark:text-gray-300 font-mono text-xs">
@@ -57,14 +57,14 @@ function truncateAddress(address: string | null): string {
       <!-- Diff view -->
       <div v-if="version.diff">
         <p class="text-xs font-semibold text-gray-500 uppercase mb-2">Modifications</p>
-        <CommonDiffView :diff="version.diff" />
+        <DiffView :diff="version.diff" />
       </div>
 
       <!-- Proposed text (fallback if no diff) -->
       <div v-else-if="version.proposed_text">
         <p class="text-xs font-semibold text-gray-500 uppercase mb-2">Texte propose</p>
         <div class="bg-green-50 dark:bg-green-900/10 border border-green-200 dark:border-green-800 rounded-lg p-3">
-          <CommonMarkdownRenderer :content="version.proposed_text" />
+          <MarkdownRenderer :content="version.proposed_text" />
         </div>
       </div>