Summary:
Setting null as an array key is deprecated since PHP 8.5 per https://www.php.net/releases/8.5/en.php: "Using null as an array offset or when calling array_key_exists() is now deprecated. Use an empty string instead."

```
ERROR 8192: Using null as an array offset is deprecated, use an empty string instead at [/var/www/html/phorge/phorge/src/applications/phid/handle/pool/PhabricatorHandlePool.php:29]
#0 PhabricatorHandlePool::newHandleList(array) called at [<phorge>/src/applications/people/storage/PhabricatorUser.php:973]
#1 PhabricatorUser::loadHandles(array) called at [<phorge>/src/applications/people/storage/PhabricatorUser.php:987]
#2 PhabricatorUser::renderHandle(NULL) called at [<phorge>/src/applications/transactions/storage/PhabricatorModularTransactionType.php:185]
#3 PhabricatorModularTransactionType::renderHandle(NULL) called at [<phorge>/src/applications/transactions/storage/PhabricatorModularTransactionType.php:195]
#4 PhabricatorModularTransactionType::renderOldHandle() called at [<phorge>/src/applications/almanac/xaction/AlmanacInterfaceNetworkTransaction.php:20]
```

Closes T16506

Test Plan:
1. PHP 8.5
2. Go to http://phorge.localhost/almanac/network/edit/ and create some Network
3. Go to http://phorge.localhost/almanac/device/edit/form/default/
4. Enter a name, click "Create Device"
5. On resulting http://phorge.localhost/almanac/device/view/device2/ , click "Add Interface"
6. Select that Network, enter random stuff under "Address", enter a random number under "Port", click "Create Interface"
7. Go to http://phorge.localhost/feed/transactions/

Reviewers: O1 Blessed Committers, mainframe98

Reviewed By: O1 Blessed Committers, mainframe98

Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T16506

Differential Revision: https://we.phorge.it/D26783

Summary:
`strlen()` was used in Phabricator to check if a generic value is a non-empty string.
This behavior is deprecated since PHP 8.1. Phorge adopts `phutil_nonempty_string()` as a replacement.

Note: this may highlight other absurd input values that might be worth correcting
instead of just ignoring. If phutil_nonempty_string() throws an exception in your
instance, report it to Phorge to evaluate and fix that specific corner case.

```
ERROR 8192: strlen(): Passing null to parameter #1 ($string) of type string is deprecated at [/var/www/html/phorge/phorge/src/applications/transactions/xaction/PhabricatorEditEngineNameTransaction.php:17]
```

Closes T16515

Test Plan: Unclear, likely rename some EditEngine (see e.g. http://phorge.localhost/transactions/editengine/) and go to http://phorge.localhost/feed/transactions/ and export data

Reviewers: O1 Blessed Committers, mainframe98

Reviewed By: O1 Blessed Committers, mainframe98

Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T16515

Differential Revision: https://we.phorge.it/D26782

Summary:
Make long referenced object titles (markup like `{D1}` or `{T1}` wrap in a Remarkup context (description section, comment preview, transaction comments) not to become unreadable.
Keep current `white-space: nowrap` for `.phui-tag-view` (introduced in rPce30f8c88bf6541ebbdfa1dd6920658a4cd0255f) for other contexts.

Closes T16077

Test Plan:
* Paste the monogram of an object with a long name in curly brackets in a task description and a task comment on a screen with low viewport width.
* Create a project tag with a long name and associate it to a task, look at that task in a list of Maniphest query search results on a screen with low viewport width.

Reviewers: O1 Blessed Committers, valerio.bozzolan

Reviewed By: O1 Blessed Committers, valerio.bozzolan

Subscribers: keithzg, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T16077

Differential Revision: https://we.phorge.it/D26024

Summary: Closes T16513

Test Plan: Run static code analysis; read the code.

Reviewers: O1 Blessed Committers, mainframe98

Reviewed By: O1 Blessed Committers, mainframe98

Subscribers: mainframe98, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T16513

Differential Revision: https://we.phorge.it/D26777

Summary: Closes T16512

Test Plan: Run static code analysis; look at other setValueFromStorage() implementations in other `PhabricatorCustomField` subclasses.

Reviewers: O1 Blessed Committers, mainframe98

Reviewed By: O1 Blessed Committers, mainframe98

Subscribers: mainframe98, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T16512

Differential Revision: https://we.phorge.it/D26776

Summary:
Setting null as an array key is deprecated since PHP 8.5 per https://www.php.net/releases/8.5/en.php: "Using null as an array offset or when calling array_key_exists() is now deprecated. Use an empty string instead."
```
ERROR 8192: Using null as an array offset is deprecated, use an empty string instead at [/var/www/html/phorge/phorge/src/applications/conpherence/storage/ConpherenceThread.php:276]
```

Closes T16510

Test Plan: A bit unclear. For me: PHP 8.5, have Conpherence application enabled, go to Feed Transactions at http://phorge.localhost/feed/transactions/

Reviewers: O1 Blessed Committers, mainframe98

Reviewed By: O1 Blessed Committers, mainframe98

Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T16510

Differential Revision: https://we.phorge.it/D26775