Clean up main.tsx, move E2E and sentry to modules, fix error boundary

[Cas Linden (CasLinden)]

Summary

• Sentry and E2E code moved to modules
• E2E setup is conditional, and impact on sentry initiation minimal
• Env var is made clearer
• The fallback error component now has a recovery path

Test Plan

Farhan (@fkb032) please double check if I broke anything in the tests.
This PR is not so much about the tests as it is about their code impact.

I wasn't able to test on MacInCloud, and that thing is pretty much busy running peekaboo 24/7 on our PR branches, but te PR passed these local checks before pushing:

• peekaboo-workflow-contract-self-test.mjs passes — the refactor's structural invariants are intact
• bun -F native test:e2e (Playwright web smoke) — 2/2 pass; the new awaited bootstrap() order renders fine
• new apps/native/src/lib/sentry/sanitize.test.ts — 14/14 pass; covers the extracted redaction pipeline (now a shared module consumed by both Sentry beforeSend and the E2E DOM snapshot path)
• Sentry init + capture hot path verified

Docs

• No docs update needed

[github-actions]

	Warnings
⚠️	Please assign this PR to someone (usually yourself).
⚠️	❗ Big PR (1554 lines changed). Consider splitting it into smaller, focused changes.

	Messages
📖	🤖 This PR touches CI / infra — reviewers please pay extra attention: .github/workflows/peekaboo-e2e.yml

📋 PR Overview

Lines changed	1554 (+930 / -624)
Files	10 added, 7 modified, 1 deleted
Draft / WIP	no
Has Test Plan	yes
New UI components	yes (1)
New Storybook stories	yes (1)
New Rust modules	no
New TS source files	yes (7)
New tests	yes (1)
package.json touched	no
Cargo.toml touched	no
Infra / CI touched	yes

Generated by 🚫 dangerJS against da2604d

[Cas Linden (CasLinden)]

drafting, need to check something

[github-actions]

nixmac Peekaboo E2E: ❌ FAIL

• Result: 4 pass / 7 fail / 0 inconclusive / 56 not required
• CU parity coverage: 1/24
• Evidence: 16 screenshots / 8 timestamped video frames
• Report fetch: complete
• Secret scan: true
• Next action: Open the report and inspect failures before approval.
• Hosted HTML report: https://htmlpreview.github.io/?https://github.com/darkmatter/nixmac/blob/gh-pages/peekaboo-e2e/pr-129/run-25722525497-1/index.html
• Latest report for this PR: https://htmlpreview.github.io/?https://github.com/darkmatter/nixmac/blob/gh-pages/peekaboo-e2e/pr-129/latest/index.html

[Juanpe Bolívar (arximboldi)]

The code looks much nicer 👏

I tried to run the the commands in the "test" plan, I am having trouble with this one:

bun -F native test:e2e
native test:e2e $ playwright test
│ [33 lines elided]
│     ║     npx playwright install                                 ║
│     ║                                                            ║
│     ║ <3 Playwright Team                                         ║
│     ╚════════════════════════════════════════════════════════════╝
│
│     Error Context: test-results/app-page-has-expected-title-chromium/error-context.md
│
│   2 failed
│     [chromium] › e2e/app.spec.ts:10:1 › app shell mounts ───────────────────────────────────────────
│     [chromium] › e2e/app.spec.ts:18:1 › page has expected title ────────────────────────────────────
└─ Exited with code 1

On my end it looks fine but probably Farhan (@fkb032) wants to check if e2e tests still run.