feat: add memory candidates viewer with filtering and confidence visualization

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

implementation-plans/issue-016.md

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+---
+---
+
+# Issue #16: Memory candidates viewer
+
+**Status:** COMPLETED
+**Issue:** https://git.shahondin1624.de/llm-multiverse/llm-multiverse-ui/issues/16
+**Branch:** `feature/issue-16-memory-viewer`
+
+## Acceptance Criteria
+
+- [x] Dedicated `/memory` route
+- [x] List of `MemoryCandidate` entries
+- [x] Each entry shows: content, source badge, confidence score
+- [x] Entries grouped by session
+- [x] Confidence score visualized (progress bar with color-coding)
+- [x] Filterable by source or confidence threshold
+
+## Implementation
+
+### New Files
+- `src/lib/stores/memory.svelte.ts` — reactive store for memory candidates grouped by session ID, with localStorage persistence, sample/demo data, and `addCandidates()` / `getAllBySession()` / `clearSession()` API
+- `src/lib/components/MemoryCandidateCard.svelte` — card component displaying a single memory candidate with content, color-coded source badge (Tool Output=blue, Model Knowledge=purple, Web=green, Unspecified=gray), and horizontal confidence progress bar with percentage
+- `src/routes/memory/+page.svelte` — dedicated memory route with session-grouped layout, source dropdown filter, confidence threshold slider, empty state, and back-to-chat link
+- `src/routes/memory/+page.ts` — SSR disabled for this route
+
+### Modified Files
+- `src/routes/+page.svelte` — added Memory Candidates navigation link on the home page
+- `src/routes/chat/+page.svelte` — added Memory link in the header next to Lineage; wired up capture of `finalResult.newMemoryCandidates` into the memory store
+
+### Key Decisions
+- Uses sample/demo data seeded into localStorage on first load, since the orchestrator doesn't currently include memory candidates in typical responses
+- `StoredMemoryCandidate` type decouples the UI store from protobuf Message dependency (same pattern as lineage's `SimpleAgentIdentifier`)
+- Confidence bar color-coded: green (>=80%), amber (>=50%), red (<50%)
+- Source badge colors match the project's existing badge conventions (blue, purple, green, gray)
+- Grid layout (1-3 columns responsive) for candidate cards within each session group
+- Filter controls use a source dropdown and a range slider for confidence threshold