feat: live memory materialization — nodes spawn in 3D graph in real-time

When memories are created, promoted, deleted, or dreamed via MCP tools,
the 3D graph now shows spectacular live animations:

- Rainbow particle burst + elastic scale-up on MemoryCreated
- Ripple wave cascading to nearby nodes
- Green pulse + node growth on MemoryPromoted
- Implosion + dissolution on MemoryDeleted
- Edge growth animation on ConnectionDiscovered
- Purple cascade on DreamStarted/DreamProgress/DreamCompleted
- FIFO eviction at 50 live nodes to guard performance

Also: graph center defaults to most-connected node, legacy HTML
redirects to SvelteKit dashboard, CSS height chain fix in layout.

Testing: 150 unit tests (vitest), 11 e2e tests (Playwright with
MCP Streamable HTTP client), 22 proof screenshots.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/dashboard/build/_app/immutable/entry/start.DFI9HUYp.js

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apps/dashboard/build/_app/immutable/entry/start.DFI9HUYp.js.br

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apps/dashboard/build/_app/immutable/entry/start.DK-jGlmm.js

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apps/dashboard/build/_app/immutable/entry/start.DK-jGlmm.js.br

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apps/dashboard/build/_app/immutable/nodes/1.DaR0oFWP.js.br

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apps/dashboard/build/_app/immutable/nodes/1.F9_eX3ZM.js

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apps/dashboard/build/_app/immutable/nodes/3.GWPnnBpN.js

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apps/dashboard/build/_app/immutable/nodes/3.GWPnnBpN.js.br

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