feat: centralize frontend Vuetify styling

docs/TASKS/frontend/003-vuetify-button-migration.md

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+# Task: Replace native feature buttons with Vuetify controls
+
+## Goal
+
+Move remaining interactive feature-screen buttons from native `<button>` elements to Vuetify controls so button styling consistently flows through Vuetify.
+
+## Scope
+
+- Replace action buttons with `v-btn`.
+- Replace icon-only buttons with `v-btn` using icon-sized styling.
+- Preserve specialized non-button native controls only when Vuetify would reduce capability, such as file inputs.
+- Keep behavior unchanged while converting one feature area at a time.
+
+## Likely Files
+
+- `frontend/src/components/ImageCropperDialog.vue`
+- `frontend/src/features/**/**/*.vue`
+- `frontend/src/static/**/*.vue`
+
+## Validation
+
+```bash
+cd frontend
+npm run build
+```
+
+## Done
+
+- [x] Native `<button>` elements under `frontend/src/**/*.vue` were migrated to `v-btn`.
+- [x] Public SSR rendering installs the shared Vuetify plugin.
+- [x] Frontend build and public prerender pass.