Consolidate related cards into fewer, richer cards (audit and merge map) #197

Goal

Reduce the card count by merging cards that describe the same thing, giving each merged card sections instead of separate tiles.

Scope

• Audit all 20 cards (what each shows, what it shares with others, how often it matters) and write the proposed merge map in this issue before changing code. Candidates: Ship + Cargo + Materials; Engineering + Engineers + Materials; Market + Trade + Route; Location + Ranks summary; leave Radio, Galnet and Community Goals standalone unless the audit says otherwise.
• Implement the merges one card at a time as separate PRs, each keeping every existing behaviour, setting and developer-mode sample source (AGENTS.md rule 7) working.
• Persisted layout must handle removed card ids (existing tolerance) and map old ids to the new merged card so users do not lose their placement.
• The Twitch card sections and overlay content are unaffected.

Acceptance criteria

• The audit and merge map are agreed before the first merge lands.
• No functionality is lost; each merged card keeps its tests.
• Upgrading users keep sensible placement, and nothing crashes on old layout ids.

Part of the epic #194.

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