refactor(renderer): route all Phosphor icon imports through ui/icons barrel

Create src/renderer/components/ui/icons.ts as the single re-export point
for every Phosphor icon the renderer touches, then rewrite the 95 files
that previously imported directly from "@phosphor-icons/react" to pull
from the relative-path-to-barrel instead. The TitleBar commit earlier
in this series already used ui/icons; this commit extends the pattern
to the rest of the renderer.

Benefits now wired in:
  - one location where bundle tree-shaking can be reasoned about,
  - typos like Briefcase vs BriefCase show up against a finite list,
  - re-theming or swapping icon sets is a one-file edit,
  - a lint rule that flags raw @phosphor-icons/react imports can be
    added later without mass-rewriting call sites.

The barrel also re-exports the `Icon` type so call sites that type
icon props against the Phosphor component type work unchanged.

Test count stays at 363 passing; typecheck stays at 156 errors.

src/renderer/components/company-onboarding/CompanyStep.tsx

@@ -1,4 +1,4 @@
-import { Buildings, FolderOpen } from "@phosphor-icons/react";
+import { Buildings, FolderOpen } from "../ui/icons";
 import type { ConnectorId } from "@shared/types";
 import { ActionButton, Input, TextArea, Select } from "../ui";
 import { OnboardingStep } from "./OnboardingStep";

src/renderer/components/company-onboarding/ExecutionModeStep.tsx

@@ -1,4 +1,4 @@
-import { ArrowRight, Brain, UserCircle, type Icon } from "@phosphor-icons/react";
+import { ArrowRight, Brain, UserCircle, type Icon } from "../ui/icons";
 import { OnboardingStep } from "./OnboardingStep";
 import { useOnboarding } from "./OnboardingContext";
 

src/renderer/components/company-onboarding/LaunchStep.tsx

@@ -1,5 +1,5 @@
 import { motion } from "framer-motion";
-import { CheckCircle, Rocket } from "@phosphor-icons/react";
+import { CheckCircle, Rocket } from "../ui/icons";
 import { ActionButton } from "../ui";
 import { useOnboarding } from "./OnboardingContext";
 

src/renderer/components/company-onboarding/MissionStep.tsx

@@ -1,5 +1,5 @@
 import { motion } from "framer-motion";
-import { Cpu, Lightning } from "@phosphor-icons/react";
+import { Cpu, Lightning } from "../ui/icons";
 import { ActionButton, Input, TextArea } from "../ui";
 import { getStepNumber, TOTAL_STEPS } from "./OnboardingHero";
 import { useOnboarding } from "./OnboardingContext";

src/renderer/components/company-onboarding/NodeCheckStep.tsx

@@ -4,7 +4,7 @@ import {
   ArrowRight,
   ArrowCounterClockwise,
   Terminal,
-} from "@phosphor-icons/react";
+} from "../ui/icons";
 import { ActionButton } from "../ui";
 import type { TerminalCommandKey } from "@shared/contracts";
 import { OnboardingStep } from "./OnboardingStep";

src/renderer/components/company-onboarding/OnboardingHero.tsx

@@ -7,7 +7,7 @@ import {
   Rocket,
   SlidersHorizontal,
   Target,
-} from "@phosphor-icons/react";
+} from "../ui/icons";
 import type { AppLocale } from "@shared/locale";
 
 export type OnboardingStep =

src/renderer/components/company-onboarding/ProvidersStep.tsx

@@ -1,5 +1,5 @@
 import { useState } from "react";
-import { ArrowRight, FloppyDisk, SignIn } from "@phosphor-icons/react";
+import { ArrowRight, FloppyDisk, SignIn } from "../ui/icons";
 import { ActionButton } from "../ui";
 import {
   CompatProviderCard,

src/renderer/components/company-onboarding/ProvidersStepShared.tsx

@@ -5,7 +5,7 @@ import {
   CaretRight,
   FloppyDisk,
   Terminal,
-} from "@phosphor-icons/react";
+} from "../ui/icons";
 import type { ProfileSnapshot } from "@shared/types";
 import type { TerminalCommandKey } from "@shared/contracts";
 

src/renderer/components/company-onboarding/WelcomeStep.tsx

@@ -1,5 +1,5 @@
 import { motion } from "framer-motion";
-import { GlobeSimple, Rocket } from "@phosphor-icons/react";
+import { GlobeSimple, Rocket } from "../ui/icons";
 import type { AppLocale } from "@shared/locale";
 import { APP_LOCALES, LOCALE_LABELS } from "@shared/locale";
 import { ActionButton } from "../ui";