Feat: rebranding, possibility for own brand

[rikled]

No description provided.

[chrip]

Good work on the server-side rebranding. The approach of using BRANDING_DIR to overlay custom branding is clean. Here are some observations:

Suggestions:

1. server.bake.Dockerfile — COPY ${BRANDING_DIR}/server/ /server (line 48):
   This overwrites the entire /server directory, not just branding-specific files. If a custom branding dir doesn't include all server subdirectories, the build will silently drop missing files. Consider a more targeted approach (e.g., COPY --no-chown ${BRANDING_DIR}/server/Common/ /server/Common/ for specific paths) or add a validation step to ensure all required files are present.

2. webpack.config.js — hardcoded fallback (line 11):
   const appName = process.env.APP_NAME || 'Euro-Office'; hardcodes 'Euro-Office' as the fallback. For a rebranding PR, this should be 'DocumentServer' or left undefined so upstream defaults apply. Otherwise any build without APP_NAME explicitly set will still produce Euro-Office branded output.

3. CSS comment stale after color change — Tabs.module.scss line 45:
   /* ensure orange while focused/pressed */ is now incorrect since the color was changed to blue. Worth a quick cleanup.

4. process.env.APP_NAME in React components — Menu.js, LoginPage.js, SetupPage.js:
   Reading process.env.APP_NAME directly in React components works because webpack's DefinePlugin replaces it at build time, but this is implicit. Consider adding a comment or using a dedicated config module to make this explicit and prevent confusion for future contributors.

5. Missing newline at EOF — server.bake.Dockerfile ends without a trailing newline (git diff shows \ No newline at end of file). Minor but worth fixing.

6. APP_NAME vs COMPANY_NAME naming (line 52):
   The env var is named APP_NAME but set to COMPANY_NAME. For brands where the company name differs from the product/app name (e.g., "Nextcloud" as company but "Nextcloud Office" as app name), this limits flexibility. Consider separating APP_NAME and COMPANY_NAME as distinct variables.

Overall: Solid work. Once the webpack fallback and BRANDING_DIR overwrite concerns are addressed, this is ready to merge.

[rikled]

webpack fallback is desired behavior. ${BRANDING_DIR} overwrite behavior is ok for now imho.