fix(gantt): render on direct reload + Sprint 2-5 QA test cases

[parth0025]

Two related changes from the Sprint 5 QA pass.

Fix — Gantt renders on direct reload (commit 6e9cc3a)

Bug: reloading the page with the Gantt tab active showed an empty chart (0 scheduled + empty Unscheduled tray); reaching Gantt via List worked.
Cause: the project task list is loaded into the Vuex store by whichever task view (List/Table/Board) mounts, via taskListHelper().groupBy(...). Gantt only read the store, so a direct reload into the Gantt tab left it empty.
Fix: GanttView triggers the same loader on mount only when the store is empty for the project+sprint (no double-fetch when arriving from another view), and retries if sprints arrive late; the existing reactive watch renders once the data lands. Retains the earlier reopen-crash fix (dhtmlx singleton, no destructor(), guarded init()).

Docs — Sprint 2–5 feature test cases (commit cd6b4cc)

10 per-feature files in .claude/test-cases/, matching the folder's existing template (ID | Title | Precondition | Steps | Expected | Actual | Status):
Integrations (Slack + Discord), CSV importer, Trello importer, story points, @mentions, velocity, CFD, reports PDF export, Gantt, recurring tasks.

• Third-party setup steps are written as the first "configure" case (Slack app → Incoming Webhook, Discord channel webhook, Trello board → Export as JSON).
• The Gantt file includes regression cases for the fix above.
• Skips BurndownChart.md (S4-01, already present); excludes n8n (not implemented).

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