feat(files): surface .pad files under the 'Documents' type filter (#27)

[Jaggob]

What

Make .pad files appear in the Files app's type filter, without DOM-patching the (non-public) filter Vue UI.

Approach

Alias the application/x-etherpad-nextcloud mimetype onto the core x-office/document type in the RegisterMimeType repair step. The Files type filter matches a node against each category's mimetypes including the mimetype alias (OC.MimeTypeList.aliases[mime]), so aliased pads show up under the built-in Documents filter. No JS, no new dependency; works across the whole supported NC range (the mimetype-alias mechanism is stable, unlike the v4-only registerFileListFilter API).

Regenerating the browser alias map (the important bit)

The type filter reads OC.MimeTypeList.aliases, which is baked into core/js/mimetypelist.js. Nextcloud does not regenerate that file on app install/enable — so without action the alias would sit in config/mimetypealiases.json but the filter wouldn't pick pads up until someone ran occ maintenance:mimetype:update-js. The repair step therefore regenerates mimetypelist.js itself (best-effort): it mirrors the maintenance command using the public IMimeTypeDetector::getAllAliases() / getAllNamings() plus the core file builder, guarded by class_exists / method_exists / writability checks and a try/catch, and falls back to logging the manual command on any mismatch. (Thanks @codex for catching this.)

Icons

The file list keeps the pad glyph (rows render the PadPreviewProvider thumbnail, not the mimetype icon) and the "New" menu uses its own etherpad icon. The generic document icon only appears where no preview is rendered (file-picker dialogs / search). The now-obsolete custom mimetype-icon sync is dropped.

Acceptance

• .pad files appear in the Files type filter (under Documents)
• No DOM patching of the Vue filter UI
• Works across the info.xml NC range
• No manual maintenance command required (repair step regenerates the alias JS)

Verification

• PHPUnit 409 + Psalm green.
• Live on NC 33 via occ maintenance:repair: the alias is written and mimetypelist.js is regenerated automatically (confirmed by blanking the alias from the JS and watching the repair step restore it). Pads show under the Documents filter; file-list pad icon preserved.
• Full Playwright suite green (pad create/open unaffected by the alias change).

Diff

lib/Migration/RegisterMimeType.php (alias + JS-map regeneration, drop obsolete icon sync), .gitignore (ignore stray root screenshots/probe scripts).

Closes #27.

[chatgpt-codex-connector]

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