fix(settings): save the guest allowlist again and add a default quota selector

[ernolf]

Summary

Two changes to the Guests admin settings page (src/views/GuestSettings.vue and the config plumbing behind it):

1. Fix: changing the guest app allowlist is now persisted again.
2. Feature: a default quota for new guest accounts can now be set from the Guests tab.

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1. Fix: allowlist changes are not saved

Fixes #1591. (This is also the allowlist-selector remainder of #995, which was closed after #1598 — but #1598 only fixed the on/off switches; the allowlist NcSelect itself still used @input="saveConfig", which @nextcloud/vue 9 no longer emits, the same Vue 3 migration regression as #1323.) So editing the list of allowed apps sent no PUT /apps/guests/config and was lost on reload.

The selector is reworked to match the inline-edit pattern used in the Accounts management:

• The current allowlist is shown read-only as wrapping chips (the full list stays visible, no truncation) with an edit (pencil) button, indented under the "Limit guest access to an app's allowlist" switch it belongs to.
• Clicking the pencil opens the NcSelect; edits go to a draft. A confirm (check) button applies the draft and saves. Closing the dropdown no longer saves on its own, and the save no longer relies on the dead @input event.
• The reset button keeps working and now also refreshes the draft while editing.

2. Feature: default quota for new guest accounts

Adds a quota selector to the Guests tab, mirroring the Accounts quota field:

• Options: Default (…), Unlimited, 1 GB / 5 GB / 10 GB, plus a typed custom value. Typing a number offers it with selectable units (e.g. 500 → 500 KB / 500 MB / 500 GB); a unit is required so the stored value is unambiguous.
• The Default option shows the actual preset-derived value (e.g. "Default (1 GB)"), read from the config lexicon via IAppConfig::getDetails(). Selecting it removes the override so the preset default applies again.

Backend: Config gains getGuestQuota(), hasGuestQuotaOverride(), getGuestQuotaDefault() and setGuestQuota(); SettingsController::getConfig() returns guestQuota (the default sentinel when no override is stored) and guestQuotaDefault, and setConfig() accepts and validates guestQuota (computerFileSize). The existing GuestManager already applies guest_quota on guest creation, so no behaviour change there.

Closes #1601

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Testing

• Allowlist: add/remove apps, confirm with the check button, reload — the selection persists. Toggling the switch and the reset button still work.
• Quota: pick a preset / Unlimited / a typed size, reload — the value persists; "Default (…)" removes the override; a bare number without a unit is rejected.

Notes

• The allowlist fix is also relevant to the 4.7 line (same as fix(settings): use @update:modelValue so admin switches save again #1598); a backport may be wanted.

• New user-facing strings are added in the usual places for translation.

• Also corrects three README links that still pointed to the removed master branch (now main).

• The content of this PR was partly generated using AI:
  Assisted-by: ClaudeCode:claude-opus-4-8

Screenshots:

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[susnux]

As per policy please add the AI disclosure to the commit:

https://github.com/nextcloud/.github/blob/master/AI_POLICY.md#disclosure

[ernolf]

As per policy please add the AI disclosure to the commit:

Done ✅ — sorry, I wasn't aware of the policy. Added the Assisted-by: trailer to the commit and the PR-Text. Thanks for the pointer!

resolved

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