feat(hermes-plugin): Discover signal-creation intake

[serefyarar]

Summary

• Adds the Mac/web fast-signal intake funnel to Hermes Discover (/intents/intake/* + /intents/confirm) behind features.fastSignalIntake.
• New CTA (“who are you trying to meet?”), empty-list entry, and post-onboarding open when there are no intents yet; confirms into intent detail.
• In progress / design TBD: functional flow is wired in Hermes chrome; @serensandikci will finish the design.

Test plan

• cd packages/hermes-plugin && bun run test (desktop notifications + smoke)
• With FAST_SIGNAL_INTAKE=true, open Discover → create CTA → complete start → question → where → summary → confirm
• With flag off, CTA hidden; orchestrator chat create path unchanged
• After Getting started with zero intents + flag on, intake opens automatically
• Desktop plugin rebuild present (bun run build:desktop) and linked install picks up 0.24.0

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[serefyarar]

@serensandikci — review requested.

Status: in progress. The intake flow is wired end-to-end in Hermes Discover (fast intake + confirm). Please take design from here — layout/chrome polish is yours to finish.