Add optional purchase confirmation before buying a generator (#109)

[tastybento]

Closes #109

Problem

Players reported buying generators unwittingly — a single click on the BUY action purchases immediately.

Change

Adds a buy-confirmation config option (default true). When enabled, buying a generator asks the player to confirm in chat before any money is taken.

The three BUY click handlers (GeneratorUserPanel ×1, GeneratorViewPanel ×2) previously duplicated the same purchase logic. They now delegate to a shared CommonPanel.purchaseGenerator(island, data, tier) helper, which:

• refreshes the panel and returns if the generator can't be purchased (the reason is already messaged by canPurchaseGenerator),
• purchases directly when confirmation is disabled,
• otherwise requests a chat confirmation via the existing ConversationUtils.createConfirmation and only purchases on confirm.

The chat-confirmation approach matches how this addon already confirms other actions (e.g. library data replacement).

Added

• Settings.buyConfirmation (buy-confirmation, default true) + getter/setter.
• stone-generator.conversations.confirm-generator-purchase locale string (en-US).
• CommonPanel.purchaseGenerator shared helper.

Tests

CommonPanelPurchaseTest:

• setting defaults to true,
• can't-purchase → no buy, panel rebuilt,
• confirmation disabled → buys directly, no conversation,
• confirmation enabled → buys only after confirm; decline → no buy.

Full suite: 66 tests pass.

Note: uses a chat confirmation (consistent with existing confirmations). If a yes/no button GUI is preferred instead, that's a straightforward follow-up.

🤖 Generated with Claude Code

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.8% Duplication on New Code

See analysis details on SonarQube Cloud