Sizzle brand: match Sizzle's professional voice in app copy

[sohni-tagirisa]

Sub-PR of Epic #1666 — text/voice to match Sizzle

Matches the text in pdd/frontend to the professional, tech-savvy voice of the Sizzle landing page, using the gist's promptdriven.ai / Sizzle copy as the reference.

What changed

Rewrote the five view-header subtitles from generic Automatically… filler into Sizzle's confident, concrete, declarative voice:

View	Before	After
Dev Units	Manage your development modules and architecture	Your prompts are the source. Manage every module and its architecture in one place.
Bug Investigation Agent	Automatically investigate GitHub issues and generate failing test cases	Point it at a GitHub issue. It reproduces the bug and writes the failing test.
PR Fix Agent	Automatically fix code issues based on PR review comments	Turns PR review comments into committed fixes — no manual round-trips.
Change Request Agent	Automatically implement feature requests and changes from GitHub issues	Describe the change in a GitHub issue. Ship the implementation as a reviewable PR.
Settings	Configure project settings and preferences	Configure your project, models, and workflow preferences.

Scope notes

• Text only. No color/layout changes — the header wordmark restyle and color tokens belong to sibling PR Sizzle brand restyle: palette, blue/green accents, light-blue background #1670.
• Base is epic/sizzle-brand-consistency, not main.
• pdd/frontend is the PDD app UI (not the marketing site, which is a separate private Next.js repo), so this matches Sizzle's voice on the app's most prominent copy rather than porting marketing sections 1:1.

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