Expand WORKER_NAMES or add unique name generation

[itsmiso-ai]

Problem

scripts/constants.gd defines only two worker names:

const WORKER_NAMES := ["Jun", "Mara"]

recruit_worker() in scripts/main.gd (line 1080) cycles through them by index:

var next_index: int = current % len(WORKER_NAMES)
var new_worker := {
    "name": WORKER_NAMES[next_index],
    ...
}

With BASE_WORKER_CAP = 2 and each hut adding +2, even one hut raises the cap to 4. Workers cycle: Jun, Mara, Jun, Mara. Two workers named "Jun" are indistinguishable in the UI, the event log, and WORKER_BADGE_COLORS (which keys on name).

Fix

Options (pick one):

1. Expand the list — add 8-10 more names to WORKER_NAMES and the corresponding badge colors to WORKER_BADGE_COLORS
2. Unique suffix — append a number or roman numeral when cycling: "Jun II", "Mara II"
3. Random from expanded pool — pick randomly from a larger list, with collision avoidance

Option 1 is simplest and keeps the deterministic cycling. The pool needs to cover at least the max realistic worker count (~8-10 with multiple huts).

Acceptance criteria

• No two active workers share the same name
• WORKER_BADGE_COLORS has an entry for every name in WORKER_NAMES
• Names fit the game's tone (short, casual, cozy)