feat: rebrand to website design, Apple HIG icons, ASCII onboarding animation

- Align Electron CSS with website design schema (Inter font, #FBFAF5/#191919
  palette, #213448/#94B4C1 accent)
- Generate proper app icons from logo.svg via cairosvg (no more Pillow ladder)
- Square bg icons for Electron/tray (Apple HIG — OS applies squircle mask)
- Circle bg icons for website favicon only
- Add scrolling ASCII agent-activity animation to onboarding hero left panel
- Remove dock.setIcon() — let macOS use bundle .icns with system mask
- Fix goal title overflow with min-w-0 for flex truncation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/renderer/components/dashboard/GoalProgress.tsx

@@ -22,12 +22,12 @@ export function GoalProgress({ goals, tasks, onNavigate }: { goals: GoalRecord[]
             onClick={() => onNavigate("goals")}
             className="focus-ring w-full rounded-[8px] border border-[color:var(--line)] bg-[color:var(--panel)] px-4 py-3.5 text-left transition hover:border-[color:var(--line-strong)] hover:shadow-sm"
           >
-            <div className="flex items-center justify-between">
-              <div className="flex items-center gap-2">
-                <Target size={15} weight="fill" className="text-[color:var(--accent)]" />
+            <div className="flex items-center justify-between gap-3">
+              <div className="flex min-w-0 items-center gap-2">
+                <Target size={15} weight="fill" className="shrink-0 text-[color:var(--accent)]" />
                 <span className="truncate text-[13px] font-medium text-[color:var(--text)]">{goal.title}</span>
               </div>
-              <span className="whitespace-nowrap text-[13px] font-bold tabular-nums text-[color:var(--accent)]">{pct}%</span>
+              <span className="shrink-0 whitespace-nowrap text-[13px] font-bold tabular-nums text-[color:var(--accent)]">{pct}%</span>
             </div>
             <div className="mt-2.5 h-2 w-full overflow-hidden rounded-full bg-[color:var(--panel-soft)]">
               <div