Applications page: show the logo shipped with the app

[stephdl]

The Applications page shows the generic placeholder logo for apps when the repository is not reachable or disabled. The app drawer, fed by the same list-modules output, shows the correct logo for those apps, so the two views disagree.

The reason is that the table keeps the logo only when it is an absolute URL, which is what a repository serves. An app installed outside any repository publishes its logo with its own UI bundle, and list-modules reports that local path, which the table discards.

Proposed solution

Keep both logo sources for each row: the repository logo first, then the one the app published with its own bundle. Show the first one that loads, and fall back to the shipped default asset if none does.

Alternative solutions

Accept the local path as well and use it when the repository logo is missing. This is simpler, but a published bundle can disappear, and the row would then show a broken image instead of the placeholder.

Additional context

Reproduced by installing from the nethforge and after the installation, disable the repository and go to the application page

See also

NethServer/ns8-core#1281

[stephdl]

QA — core 3.22.0-dev.2 — Application logos

PR: NethServer/ns8-core#1281 — issue #8139

UI only, one file. When a repository is disabled, list-modules no longer
reports its logo. The Applications table now falls back to the logo the app
published with its own bundle, instead of dropping to the generic placeholder.

Page under test: Applications, /applications-center

1. Logos with the repository enabled

• Cluster running core:3.22.0-dev.2
• Install an app from NethForge
• Go to the Applications page: the app row shows its real logo
• The app drawer shows the same logo

2. Logos with the repository disabled

• Disable the NethForge repository in Settings > Software repositories
• Go back to the Applications page: the app is still listed, and still shows
  its real logo, not the generic placeholder
• The app drawer still agrees with the table
• An app with no logo at all shows the generic placeholder
• No broken image icon, no repeated failing request in the network tab

3. Cleanup

• Re-enable the NethForge repository

[DavidePrincipi]

What happens to Applications page if public network is not reachable? Is the app list displayed? What is the displayed logo?