Session 12: Update dev journal with Save Slot System entry

2026-08-23 09:02:08 +00:00
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 ### Session 12 - 2026-08-23 (Morning)
 **Status:** ✅ Save Slot System Added
 #### What was done:
 - Implemented a multi-slot save system with 3 independent, persistent save slots
 - Each slot stores its own data under a dedicated localStorage key (`cosmicGardenSave-<n>`), so switching slots never overwrites another slot's progress
 - Added slot selection buttons in the footer (labeled 1/2/3) that switch between saves with a confirmation prompt and auto-save the current slot first
 - Added an autosave toggle button (ON/OFF); when off, the periodic autosave loop is skipped, and the preference is persisted separately across page loads
 - Enhanced the import modal with a per-slot selector so players can paste save data into a specific slot; importing into the active slot reloads it automatically
 - Added `exportSlotToBase64()` / `importSlotFromData()` for backup/transfer of individual slots, plus `loadSlot()` helper
 - Switching to an empty slot starts a fresh game while preserving Stellar Essence and prestige counters (so prestige currency is never lost when testing new runs)
 - Added Save Slot + Autosave indicators to the Statistics panel, updated live each tick
 - Fixed a latent bug: `reset()` did not include the `goldenBlooms` event field, which crashed `Stats.update()` on any reset. Also added the same missing field to the empty-slot branch of `switchSlot()`. Both were caught by an end-to-end test harness simulating localStorage/DOM/clipboard.
 - Verified all 18 slot operations (save/load per slot, switch round-trips, empty-slot handling, export/import round-trip, persistence across reloads, reset preservation) with a Node.js DOM-simulation harness — 18/18 pass
 #### Files modified:
 - `js/game.js` - Core save-slot logic: state fields (activeSlot, autoSave), SLOTS config, getSaveKey/loadSlot/switchSlot/exportSlotToBase64/importSlotFromData methods; wired slot + autosave + import-slot event listeners; updated save()/loadState()/reset()/startAutoSave()
 - `js/ui.js` - Added updateSlotUI() to reflect active slot highlight and autosave toggle state
 - `js/stats.js` - Added Active Save Slot and Autosave indicators, refreshed each tick
 - `index.html` - Footer with slot buttons + autosave toggle; import modal slot selector; achievement count label corrected to 31/31
 - `css/game.css` - Styling for footer sections, slot buttons (active/disabled states), autosave toggle, and import-modal slot selector
 #### Next goals:
 - Add a save-slot preview (e.g. show stardust total / buildings count / last-saved time) on hover or in the stats panel to help players tell slots apart
 - Consider adding more than 3 slots via a config option or unlockable count
 - Balance tweak: review overall game pacing now that prestige and random events are in place
 *Journal auto-updated by Hermes Agent cron job (every 8 hours)*
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