Prevent crashes when task types, users and related records are missing

[NicoPennec]

Problem

• The compact NDJSON with-tasks decoder could omit assignees, leaving task.assignees undefined and crashing TaskInfo.
• isAssigned dereferenced a null user during logout/login teardown, and the Task page kept doing the same in its comment ownership checks.
• Task types, persons, statuses, episodes, departments, asset types, sequences, and productions resolved from permission-filtered or partially loaded global maps were dereferenced without a guard against a miss. This crashed task links, task-type tags, comments, validation tags, at-mentions, the attachment modal, task, kanban and edits page titles, TaskInfo, list and comment CSV exports, breakdown filenames and filter queries, list and task-list sorting, ready-for tooltips, task filtering, quota, chat, budget and production stats, stats validation columns, task-type settings, the entity load paths, and playlist load.
• Further sites of the same class remained unguarded: the expanded production-stats color bar sitting next to an already-guarded title, the remaining task-page task-type lookups, the sequences non-tvshow title, the all-tasks status stats, the entity preview and time-log task types, the estimation approval-late filter, the supervisor task index, budget labels and sorting, the my-checks episode options, the production schedule items, the metadata descriptor rename, the global search entity path, and the bulk todo edits.
• Some of those guards only moved the crash: optional-chaining for_entity fed an empty required :type param to vue-router, so task links, validation tags and comment preview links still threw at resolution.
• Sites of the same class sitting one line from a guarded one stayed exposed: the Task page user reads, the TaskInfo comment export author and status, four filter-modal query builders, the my-checks filter lists, the production stats task types, the quota and task-type lists, and the validation cell column shared by the five entity lists.
• A person missing from the map left an undefined position key in the exported budget CSV and a NaN monthly salary in the budget totals.
• The ESLint parser was pinned to ES2020 and rejected logical assignment.
• Some npm dependencies are outdated.

Solution

• Default assignees to an empty array in the compact task decoder.
• Guard isAssigned and the comment ownership checks against a null user on both the task sidebar and the task page.
• Guard every affected lookup with optional chaining, string fallbacks, early returns, or filter(Boolean), also fixing a pre-existing assignee sort that compared a name to a person object.
• Extract the duplicated assignee sort into a sortByPersonName helper shared by the shot, asset, edit, episode and sequence stores, and cover it with a unit test.
• Fall back to the task's own entity type so the :type segment always resolves, covered by unit tests on getTaskPath.
• Guard the remaining reads, filtering unresolved records out of the lists that feed them so the holes never reach the template.
• Default the budget person fields so the CSV export and the totals stay meaningful.
• Raise the ESLint parser to ES2021.
• Bump npm dependencies.