feat: display toggles, smart session resume, fix stale transcript pane (#8)

src/lib/preferences.ts

@@ -17,6 +17,9 @@ export interface LamPreferences {
   systemPrompt?: string;
   webSearchEnabled?: boolean;
   thinking?: string;
+  showToolCalls?: boolean;
+  showReasoning?: boolean;
+  resumeTimeout?: string;
 }
 
 /** Preferences with every optional value filled in, so callers never branch on undefined. */
@@ -28,6 +31,43 @@ export interface ResolvedPreferences {
   webEnabled: boolean;
   /** Undefined when reasoning is off, which is what the API client expects. */
   think?: string;
+  /** Whether the transcript lists the tools Lam called. */
+  showToolCalls: boolean;
+  /** Whether the transcript includes the model's thinking trace. */
+  showReasoning: boolean;
+  /** Idle time after which opening the command starts a fresh chat. Undefined means never. */
+  resumeTimeoutMs?: number;
+}
+
+const MINUTE = 60_000;
+const HOUR = 60 * MINUTE;
+const DAY = 24 * HOUR;
+
+/** Keep in sync with the `resumeTimeout` dropdown in `package.json`. */
+const RESUME_TIMEOUTS: Record<string, number> = {
+  "15m": 15 * MINUTE,
+  "1h": HOUR,
+  "6h": 6 * HOUR,
+  "1d": DAY,
+};
+
+/** `undefined` for "never" and for anything unrecognised, which both mean "always reopen the last chat". */
+export function resolveResumeTimeout(value: string | undefined): number | undefined {
+  return RESUME_TIMEOUTS[(value ?? "").trim()];
+}
+
+/** Human-readable form of {@link ResolvedPreferences.resumeTimeoutMs}, for the setup screen. */
+export function describeResumeTimeout(milliseconds: number | undefined): string {
+  if (milliseconds === undefined) return "Never — always reopen the last chat";
+
+  const minutes = Math.round(milliseconds / MINUTE);
+  if (minutes < 60) return `After ${minutes} minutes`;
+
+  const hours = Math.round(minutes / 60);
+  if (hours < 24) return `After ${hours} hour${hours === 1 ? "" : "s"}`;
+
+  const days = Math.round(hours / 24);
+  return `After ${days} day${days === 1 ? "" : "s"}`;
 }
 
 export function resolvePreferences(raw: LamPreferences): ResolvedPreferences {
@@ -41,6 +81,11 @@ export function resolvePreferences(raw: LamPreferences): ResolvedPreferences {
     // Defaults to on: the preference is a checkbox the user has to actively untick.
     webEnabled: raw.webSearchEnabled ?? true,
     think: thinking && thinking !== "off" ? thinking : undefined,
+    showToolCalls: raw.showToolCalls ?? true,
+    showReasoning: raw.showReasoning ?? true,
+    // Falls back to the manifest's declared default, so a missing preference
+    // behaves the same whether Vicinae substitutes it or not.
+    resumeTimeoutMs: resolveResumeTimeout(raw.resumeTimeout ?? "1h"),
   };
 }