fix: catch ValueError instead of bare except in account CLI commands

[chelsealong]

Summary

reset-password and reset-email in api/commands/account.py wrap valid_password/email_validate in a bare except: block. Both validators only ever raise ValueError on invalid input, so the bare except unnecessarily catches everything else too, including KeyboardInterrupt and SystemExit. That makes the interactive CLI prompt unresponsive to Ctrl+C while it's waiting on these calls, since the interrupt gets swallowed and reported as an "Invalid password"/"Invalid email" message instead of stopping the command.

This narrows both except: clauses to except ValueError:, matching the exception the validators actually raise.

Fixes #40348

Test plan

Added api/tests/unit_tests/commands/test_account_commands.py with a regression test for each command. Each test mocks the validator to raise KeyboardInterrupt and asserts it propagates out of the command instead of being swallowed into an "Invalid password"/"Invalid email" message.

Confirmed the tests fail against the pre-fix code (bare except:) and pass with the fix:

$ uv run --project api pytest --timeout 30 api/tests/unit_tests/commands/test_account_commands.py -v --no-cov
api/tests/unit_tests/commands/test_account_commands.py::test_reset_password_does_not_swallow_keyboard_interrupt PASSED
api/tests/unit_tests/commands/test_account_commands.py::test_reset_email_does_not_swallow_keyboard_interrupt PASSED
2 passed, 1 warning in 1.20s

Also ran the full api/tests/unit_tests/commands/ suite (174 tests) to confirm no regressions, and ruff format --diff / ruff check on the changed files (both clean).

From Claude

[github-actions]

Pyrefly Type Coverage

Metric	Base	PR	Delta
Type coverage	58.26%	58.27%	+0.00%
Strict coverage	57.84%	57.84%	+0.00%
Typed symbols	38,287	38,291	+4
Untyped symbols	27,627	27,627	0
Modules	3144	3145	+1

[chelsealong]

Fixed the Style Check failure: added return and monkeypatch: pytest.MonkeyPatch type annotations to the two new regression tests, which pyrefly's unit-tests config was flagging (unannotated-return, implicit-any-parameter). Verified locally: ./dev/pyrefly-check-local now passes clean, mypy core check passes, the 174-test api/tests/unit_tests/commands/ suite still passes, and ruff format/ruff check are clean on the changed files.