fix(app): CMP-47 consolidate agent builder presentation

[ripgrim]

Summary

Consolidates route-level loading ownership, flattens skeleton presentation, fixes light-mode code workspace colors, and tightens scope and attachment presentation.

Why

Nested loaders and mixed theme surfaces made the builder feel inconsistent even when the underlying flow was correct.

Stack

Depends on ripgrim/crm#5 — pre-deployment draft review.

1. trycompai/crm#59 — durable custom-agent domain
2. ripgrim/crm#2 — sandboxed builder and runner runtimes
3. ripgrim/crm#3 — CRM UI foundations
4. ripgrim/crm#4 — private agent-builder workspace
5. ripgrim/crm#5 — pre-deployment draft review
6. ripgrim/crm#6 — builder presentation
7. ripgrim/crm#7 — inline composer context

Verification

• Full typecheck passes
• Lint passes
• Route and builder UI QA completed

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[ripgrim]

Superseded by trycompai#64.