Fix: distribution field invisible — remove html field before complex field in Tab 3

[daimpad]

Problem

After the previous fix (PR #13), the entire distribution field in Tab 3 was invisible — no "Add Entry" button, no form, just blank space after the intro text.

Root cause: Carbon Fields cannot render a complex field when a html-type field immediately precedes it in the same tab container. The odw_dist_intro html field (intro box explaining "Was ist eine Distribution?") was blocking CF from rendering the odw_distributions complex field.

This is a CF limitation: HTML fields and complex fields cannot coexist in the same tab-level array. Tab 4 works fine because its HTML fields are followed by simple fields (text, select, date), not complex fields.

Fix

• Remove Field::make('html', 'odw_dist_intro') from Tab 3's field array
• Fold the intro text into the complex field's set_help_text() so the explanation isn't lost
• Remove the now-unused .odw-distribution-intro CSS rule from admin.css

Test plan

• Tab 3 shows the distribution complex field with "Distribution hinzufügen" button
• Clicking the button opens the distribution form (access_url, format, file size, license)
• Multiple distributions can be added
• All 90 PHPUnit tests pass

https://claude.ai/code/session_FEyiS

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