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formulas.recentlyUsed scanned the session journal for cell.set inputs. It missed formulas entered by range.* commands, lost them when the journal dropped its oldest entries (a large file open or a long script is enough), and started empty in every session. The Function Library's Recently Used menu and the Insert Function dialog list what it returns. - Prefs::recent_functions (a new engine module, recent.rs) holds the ten functions most recently entered in a formula, newest first. Session::execute updates it for every cell.* and range.* command it journals, from any source (the interface, the control channel, MCP or a script). It reads at most 2,000 of the formulas a command enters, starting from the last one; formulas longer than Excel's limit are skipped. formulas.recentlyUsed returns it. It never reads the journal back, so the journal's caps do not affect it. - The list is kept with the other engine preferences (prefs.json, the browser's storage on the web), so it survives a restart as Excel's does. It is read leniently: a malformed value loses only this list. A fresh install starts from common functions. The Insert Function dialog is titled "Insert Function", as in Excel (it said "Formula Builder"), and gains a working category list: Most Recently Used, All, then each category in Excel's order. A category may be given by label or by engine id, so a Function Library menu or the control channel (ui.dialog.set) opens it on one, and a new search switches to All. The dialog keeps its translated labels and its search in the interface language. Each row shows the function's name and its category in two columns; the category column starts after the widest name shown, so a long name in any font or formula language stays clear of it. A function counts as recently used once its formula is entered, not when OK is pressed. The unused "Formula Builder" translations are removed. Tests: engine unit tests for reading functions from formulas (strings, unknown names, over-long and malformed formulas), the formulas a command enters (newest first, within the budget), the ten-name list and the lenient read of prefs.json; tests/it/recently_used.rs for cell.set and range.setValues from the session, a failed command, a cleared journal and a save and reload of the preferences. UI tests for the menu's order and the dialog's title, categories, engine-id category, search and OK, and for the category column with a wide font.