feat: account aliases + fix Pro/Max plan detection

[vvedantb]

Summary

Two related improvements for users who manage multiple Claude accounts:

1. Fix: Pro/Max plan misdetection

inferPlanType only special-cased team/enterprise subscriptionType, then fell back to an org-scope heuristic. A Pro account whose user is an admin of their own org (organizationRole: "admin") hit that heuristic and was mislabeled "Teams".

The OAuth subscriptionType is the authoritative signal, so pro/max are now honored before the heuristic:

if (subscriptionType === 'enterprise') return 'Enterprise';
if (subscriptionType === 'pro') return 'Pro';
if (subscriptionType === 'max') return 'Max';

2. Feature: custom account aliases (--rename)

When several stored accounts share the same Claude display name (e.g. the same person's work + personal accounts), the list is ambiguous — every row shows the same name. There was no built-in way to label them, and hand-editing the store JSON didn't survive because syncStoreFromLive overwrites metadata wholesale on each sync.

This adds:

• cc-switch --rename <index> <name> (also rename) — sets entry.alias. Omit <name> to clear it. Multi-word names work without quoting.
• getEntryLabel(entry) — prefers entry.alias, falling back to the account's display name. Used in list, switch, and remove output.
• syncStoreFromLive now preserves alias across syncs (alongside lastUsedAt/usageSnapshot), so the label is stable.

cli.cjs needs no change — its switch command already forwards extra args through to cc-switch.cjs.

Example

$ cc-switch --rename 1 Personal
Renamed account: [1] Personal <me@example.com>

Stored account list:
  [0] Work     | Team Prem | 5H:94% (~2h 3min) | 7D:99% (6D 3h) | used:8m ago
* [1] Personal | Pro       | 5H:88% (~4h 43min) | 7D:98% (6D 14h) | used:6m ago

$ cc-switch --rename 1        # clears the alias, reverts to display name

Testing

• node --check on all modified files.
• Functional run against an isolated store copy: set alias, multi-word alias without quotes, clear alias (reverts to display name), and confirmed a Pro account with organizationRole: admin now reports Pro instead of Teams. Alias persists across --sync.

Files changed

• lib/output/accounts.cjs — pro/max detection + getEntryLabel
• lib/store/accounts.cjs — preserve alias on sync
• lib/actions/rename.cjs — new action
• lib/actions/switch.cjs, lib/actions/remove.cjs — use getEntryLabel
• cc-switch.cjs — wire --rename action and arg parsing
• README.md — document the flag