fix: multiple test-workflow bugs — draft wipe, dark date pickers, Jira status strings, Tempo gate, hold timer

- Fix the red/blue draft form losing unsaved fields (e.g. execution_start_time) whenever an evidence upload refetches the test — the hydration effect now runs once per test, not on every refetch.
- Add color-scheme: dark so native date/time picker popups match the app theme instead of rendering white.
- Fix _STATE_TO_JIRA_STATUS: real Jira statuses are 'To Do' and 'Red Team test review', not 'To-Do' and 'RT Test Review' — confirmed live against the actual workflow transitions, which is why Submit to Blue Team never moved the ticket past 'In Progress'.
- Tempo worklog sync was silently blocked by TEMPO_ENABLED defaulting to False with no admin-facing toggle, even after configuring a Tempo token via Settings. Now bypassed once an admin or personal token is actually configured, mirroring Jira's DB-backed enabled flag.
- Hold now actually pauses the running phase timer (paused_at), and Resume accumulates the held duration into red/blue_paused_seconds — previously the timer kept counting through a hold.

backend/app/services/jira_service.py

@@ -379,11 +379,11 @@ _STATE_EMOJI: dict[str, str] = {
 # (reopen_blue_review), that's pushed as "In Progress" directly instead of
 # through this table — see push_bt_review_reopened().
 _STATE_TO_JIRA_STATUS: dict[str, str] = {
-    "draft":            "To-Do",
+    "draft":            "To Do",
     "red_executing":    "In Progress",
-    "red_review":       "RT Test Review",
+    "red_review":       "Red Team test review",
     "blue_evaluating":  "Queued Blue Team",
-    "blue_review":      "Blue Team Test Review",
+    "blue_review":      "Blue Team test review",
     "in_review":        "Validation",
     "validated":        "Done",
     "rejected":         "Rejected",