Move SealShare onto Livewire Material

Replaces maryUI and daisyUI with nonameweb/livewire-material: the Vibrant
indigo scheme, a system/light/dark theme under sealshare-theme, one top
app bar with the account menu, the upload drop zone and link-ready
moments, M3 fields, dialogs instead of wire:confirm, snackbars instead of
flashed messages, a sortable admin table, and the starter-kit cleanup.
Docker builds assets after Composer; CI drops the Flux step.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V9NnLxnPp8vaaurb3Z1MFy

.github/workflows/lint.yml

@@ -29,9 +29,6 @@ jobs:
         with:
           php-version: '8.5'
 
-      - name: Add Flux Credentials Loaded From ENV
-        run: composer config http-basic.composer.fluxui.dev "${{ secrets.FLUX_USERNAME }}" "${{ secrets.FLUX_LICENSE_KEY }}"
-
       - name: Install Dependencies
         run: |
           composer install -q --no-ansi --no-interaction --no-scripts --no-progress --prefer-dist