feature: ISSUE-285 — at-call-time permission guards in the verify flow

[GitAddRemote]

Summary

• assignVerifiedRole / removeVerifiedRole: added pre-flight ManageRoles permission check that returns false early with a structured error log, before attempting roles.add / roles.remove
• handleVerifyButtonInteraction: replaced the setNickname try/catch with a pre-flight ManageNicknames permission guard that responds with missingPermissionNickname and returns early — eliminating the catch path that was previously unreachable in most failure modes
• Added missingPermissionNickname i18n key; removed the now-unreachable nicknameFailed key

Test plan

• role.services.test.ts: new assignVerifiedRole + removeVerifiedRole tests assert false returned and roles.add/roles.remove not called when ManageRoles is missing
• verifyButton.test.ts: replaced two stale nicknameFailed-via-throw tests with a single missingPermissionNickname guard test asserting setNickname not called and response contains "Manage Nicknames"
• npm run quality passes (542 tests)

Closes #285

[Copilot]

Pull request overview

Adds at-call-time permission guards to the verification flow so missing Discord permissions produce clearer, immediate outcomes instead of failing deeper in the API calls.

Changes:

• Add pre-flight ManageRoles checks to role assignment/removal helpers with structured error logs and early false returns.
• Add pre-flight ManageNicknames check before nickname updates in the verify button interaction with a new i18n response.
• Update/adjust Jest tests to cover the new permission-guard branches.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/services/role.services.ts	Adds ManageRoles pre-flight permission guards and logs before attempting role mutations.
src/services/tests/role.services.test.ts	Adds tests for the new ManageRoles guard branches.
src/interactions/verifyButton.ts	Adds ManageNicknames guard before setNickname and adjusts control flow accordingly.
src/interactions/tests/verifyButton.test.ts	Updates nickname-related tests to assert the new guard behavior/message.
src/locales/en.json	Adds missingPermissionNickname translation key.

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[Copilot]

The PR description says the now-unreachable nicknameFailed i18n key was removed, but it is still present here and is unused (no code references found). Either remove the key to avoid dead translations, or keep it and update the PR description/test plan to reflect that it’s still part of the contract.

[Copilot]

This early-return guard runs after the role is already assigned; when Manage Nicknames is missing the user will not receive the normal verification success message even though they are effectively verified (role added). Consider replying with the success message plus an additional warning about the missing permission (or otherwise making it explicit in the response that verification succeeded but nickname couldn’t be updated).

[Copilot]

With the try/catch removed, any setNickname failure other than missing ManageNicknames (e.g. hierarchy issues, invalid nickname length/characters) will now bubble to interactionRouter and result in a generic fallback reply. If you still want a user-actionable verification-specific message for nickname update failures, handle/translate expected DiscordAPIError cases here (or keep a narrowed catch that responds appropriately).

[Copilot]

The new "missing ManageRoles" tests only assert the boolean return and that roles.add/remove aren’t called, but they don’t assert the promised structured error log. Since you already have loadRoleServicesWithLogger() in this file, consider using it (or otherwise mocking getLogger) so the test also verifies logger.error is called with the missing-permission message and includes guildId metadata.

Suggested change

	const { assignVerifiedRole } = await import('../role.services.js');
	const member = makeMember();
	const guild = makeGuild({ member, hasManageRoles: false });
	expect(await assignVerifiedRole(makeInteraction(guild), 'user-1')).toBe(false);
	expect(member.roles.add).not.toHaveBeenCalled();
	const { assignVerifiedRole, loggerError } = await loadRoleServicesWithLogger();
	const member = makeMember();
	const guild = makeGuild({ member, hasManageRoles: false });
	expect(await assignVerifiedRole(makeInteraction(guild), 'user-1')).toBe(false);
	expect(member.roles.add).not.toHaveBeenCalled();
	expect(loggerError).toHaveBeenCalledWith(
	expect.stringContaining('ManageRoles'),
	expect.objectContaining({ guildId: guild.id }),
	);

[Copilot]

Same as above: this test exercises the missing ManageRoles guard but does not verify the structured error log that the implementation adds. Mock the logger and assert logger.error is invoked with the missing-permission message and guildId.

Suggested change

	const { removeVerifiedRole } = await import('../role.services.js');
	const member = makeMember();
	const guild = makeGuild({ member, hasManageRoles: false });
	expect(await removeVerifiedRole(makeInteraction(guild), 'user-1')).toBe(false);
	expect(member.roles.remove).not.toHaveBeenCalled();
	const { removeVerifiedRole, loggerError } = await loadRoleServicesWithLogger();
	const member = makeMember();
	const guild = makeGuild({ member, hasManageRoles: false });
	expect(await removeVerifiedRole(makeInteraction(guild), 'user-1')).toBe(false);
	expect(member.roles.remove).not.toHaveBeenCalled();
	expect(loggerError).toHaveBeenCalledWith(
	'Missing ManageRoles permission',
	expect.objectContaining({ guildId: guild.id }),
	);