Remove recordings feature, replay sessions directly, bump to 0.6.0

Recordings were just a thin named pointer over an already-captured
session's events, so the whole separate feature (recordings table, API
routes, pages, UI) is gone: any completed session can now be named and
replayed directly. Replaying no longer creates a session or duplicates
events of its own - it just bumps the source session's playCount/lastPlayedAt.

Also renames play_sessions/playSession(s) to sessions/session(s) throughout
the schema, queries, API routes, and UI for consistency, and updates the
README to match the new flow.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/(app)/stats/page.tsx

@@ -2,18 +2,16 @@ import type { Metadata } from "next";
 import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
 import { SessionsSummaryCards } from "@/components/stats/SessionsSummaryCards";
 import { DeviceUsageTable } from "@/components/stats/DeviceUsageTable";
-import { RecordingLibraryStats } from "@/components/stats/RecordingLibraryStats";
-import { getDeviceCommandCounts, getDeviceUsageStats, getRecordingLibraryStats, getSessionsSummary } from "@/lib/db/queries/stats";
+import { getDeviceCommandCounts, getDeviceUsageStats, getSessionsSummary } from "@/lib/db/queries/stats";
 
 export const dynamic = "force-dynamic";
 export const metadata: Metadata = { title: "Stats" };
 
 export default async function StatsPage() {
-  const [sessionsSummary, deviceUsage, commandCounts, recordingStats] = await Promise.all([
+  const [sessionsSummary, deviceUsage, commandCounts] = await Promise.all([
     getSessionsSummary(),
     getDeviceUsageStats(),
     getDeviceCommandCounts(),
-    getRecordingLibraryStats(),
   ]);
 
   const commandCountByDevice = new Map(commandCounts.map((c) => [c.deviceId, c.commandCount]));
@@ -23,14 +21,13 @@ export default async function StatsPage() {
     <div className="flex flex-col gap-6">
       <div>
         <h1 className="font-heading text-2xl font-semibold">Stats</h1>
-        <p className="text-sm text-muted-foreground">Usage across sessions, devices, and your recording library.</p>
+        <p className="text-sm text-muted-foreground">Usage across sessions and devices.</p>
       </div>
 
       <Tabs defaultValue="sessions">
         <TabsList className="bp-glass">
           <TabsTrigger value="sessions">Sessions</TabsTrigger>
           <TabsTrigger value="devices">Devices</TabsTrigger>
-          <TabsTrigger value="recordings">Recordings</TabsTrigger>
         </TabsList>
         <TabsContent value="sessions" className="pt-4">
           <SessionsSummaryCards summary={sessionsSummary} />
@@ -38,9 +35,6 @@ export default async function StatsPage() {
         <TabsContent value="devices" className="pt-4">
           <DeviceUsageTable devices={devices} />
         </TabsContent>
-        <TabsContent value="recordings" className="pt-4">
-          <RecordingLibraryStats stats={recordingStats} />
-        </TabsContent>
       </Tabs>
     </div>
   );