fix(calendar): parse "mins"/"hrs" reminder offsets in manage_calendar (#4266)

_reminder_minutes matched the offset with (?:m|min|minute|minutes)\b and
(?:h|hr|hour|hours)\b. The trailing \b makes the common plural
abbreviations "mins"/"hrs" fail to match (after "min" the "s" is a word
char, so no boundary), so reminder_minutes "5 mins" or "2 hrs" returned
None and the event was created with no reminder, silently.

Widen the two unit regexes and the matching reminder_only description
regex to a strict superset that also accepts mins/hrs. The sibling
duration parser already accepts these forms (it has no \b), so this only
brings the reminder parser in line.

tests/test_calendar_reminder_minutes_parsing.py

@@ -0,0 +1,88 @@
+"""do_manage_calendar must honour abbreviated reminder phrasings like "mins"/"hrs".
+
+`_reminder_minutes` parsed the reminder offset with regexes anchored on
+`(?:m|min|minute|minutes)\b` / `(?:h|hr|hour|hours)\b`. The trailing `\b`
+made the very common plural abbreviations "mins" and "hrs" fail to match
+(after "min" the next char "s" is a word char, so no boundary), so a request
+like ``reminder_minutes: "5 mins"`` silently produced no reminder at all —
+even though the sibling duration parser (no `\b`) already accepted them.
+"""
+
+import json
+import sys
+import uuid
+
+import pytest
+
+from tests.helpers.import_state import clear_fake_database_modules
+from tests.helpers.sqlite_db import make_temp_sqlite
+
+clear_fake_database_modules()
+
+import core.database as cdb
+from core.database import Note
+
+_TS, _ENGINE, _TMPDB = make_temp_sqlite(cdb.Base.metadata)
+
+
+@pytest.fixture(autouse=True)
+def _bind_temp_db(monkeypatch):
+    monkeypatch.setitem(sys.modules, "core.database", cdb)
+    parent = sys.modules.get("core")
+    if parent is not None:
+        monkeypatch.setattr(parent, "database", cdb, raising=False)
+    monkeypatch.setattr(cdb, "SessionLocal", _TS)
+    yield
+
+
+async def _create_with_reminder(reminder, owner):
+    from src.tool_implementations import do_manage_calendar
+
+    payload = {
+        "action": "create_event",
+        "summary": "Dentist",
+        # Far-future so the reminder is never "already passed".
+        "dtstart": "2030-01-01T10:00:00",
+        "reminder_minutes": reminder,
+    }
+    return await do_manage_calendar(json.dumps(payload), owner=owner)
+
+
+@pytest.mark.parametrize("reminder,expected", [
+    ("5 mins", 5),
+    ("10 mins", 10),
+    ("2 hrs", 120),
+    ("1 hr", 60),
+    ("15 minutes", 15),   # regression: long form still works
+    ("30m", 30),          # regression: bare unit still works
+])
+async def test_reminder_minutes_accepts_abbreviations(reminder, expected):
+    owner = "tester-" + uuid.uuid4().hex[:6]
+    res = await _create_with_reminder(reminder, owner)
+    assert res.get("exit_code") == 0, res
+    assert f"reminder {expected} min before" in res.get("response", ""), res
+
+    db = _TS()
+    try:
+        note = (
+            db.query(Note)
+            .filter(Note.owner == owner, Note.title == "Reminder: Dentist")
+            .first()
+        )
+        assert note is not None, "reminder note should have been created"
+    finally:
+        db.close()
+
+
+async def test_no_reminder_when_offset_absent():
+    owner = "tester-" + uuid.uuid4().hex[:6]
+    from src.tool_implementations import do_manage_calendar
+
+    payload = {
+        "action": "create_event",
+        "summary": "No Reminder Event",
+        "dtstart": "2030-02-01T10:00:00",
+    }
+    res = await do_manage_calendar(json.dumps(payload), owner=owner)
+    assert res.get("exit_code") == 0, res
+    assert "reminder set" not in res.get("response", ""), res