Display user's blossom servers in menu (#90)

* feat: Display blossom servers in user menu with caching

Implements caching and display of user's blossom server lists (kind 10063) in the user menu dropdown.

**Key Changes:**

1. **Database Schema (db.ts)**:
   - Added `CachedBlossomServerList` interface
   - Added `blossomServers` table to Dexie v15
   - Indexed by pubkey and updatedAt for efficient querying

2. **Caching Service (blossom-server-cache.ts)**:
   - Dual-layer caching: LRU memory cache (100 entries) + Dexie persistent cache
   - 24-hour TTL to reduce network requests
   - Auto-caches kind:10063 events from EventStore
   - Mirrors relay-list-cache pattern for consistency

3. **Sync Hooks**:
   - `useBlossomServerCacheSync`: Subscribes to EventStore for auto-caching kind:10063 events
   - `useAccountSync`: Extended to fetch and watch active account's blossom servers

4. **State Management**:
   - Added `blossomServers` field to `activeAccount` in GrimoireState
   - Created `setActiveAccountBlossomServers` pure function and callback
   - Reactive updates when user's server list changes

5. **User Menu UI (user-menu.tsx)**:
   - Added blossom servers section with HardDrive icon
   - Shows server count badge (e.g., "3 servers")
   - Clickable links open servers in new tabs
   - Displays only when user has configured servers

**Architecture:**
- Follows existing relay list caching pattern for consistency
- Reactive: UI auto-updates when kind:10063 events arrive
- Incremental sync: Fetches on login, caches for 24h
- Performance: Memory cache for <1ms lookups, Dexie for persistence

**Testing:**
- Build: ✓ No TypeScript errors
- Tests: ✓ All 838 tests passing

* feat: Open blossom server file lists directly from menus

**User Menu & Profile Viewer Improvements:**

1. **Enhanced Click Behavior**:
   - Clicking a blossom server now opens the file list for that server
   - Shows blobs uploaded by the user (user menu) or profile owner (profile viewer)
   - Pre-selects the clicked server in the dropdown

2. **UX Improvements**:
   - Removed server count from user menu label (cleaner UI)
   - Added `cursor-crosshair` to blossom server items (consistent with other clickable items)
   - Removed external link icon (not opening external URL anymore)

3. **Technical Changes**:
   - Updated `ListBlobsView` to accept optional `serverUrl` prop for pre-selection
   - User menu: Opens `blossom list` with `serverUrl` for active user
   - Profile viewer: Opens `blossom list` with both `pubkey` and `serverUrl`

**Flow:**
- User menu → Click server → Opens files for active user on that server
- Profile viewer → Click server → Opens files for viewed user on that server

* fix: Properly fetch blossom servers for any profile view

**Problem:**
Blossom servers were only visible for the logged-in user's profile,
not for other users' profiles being viewed.

**Solution:**
Enhanced ProfileViewer blossom server fetching with multi-layer approach:

1. **Cache-first loading**: Check blossomServerCache for instant display
2. **EventStore check**: Use existing cached event if available
3. **Reactive subscription**: Subscribe to EventStore for real-time updates
4. **Network fetch**: Use addressLoader to fetch latest from relays
5. **Auto-caching**: Update cache when new events arrive

**Benefits:**
- Blossom servers now display for ANY user's profile
- Instant display from cache (< 1ms)
- Reactive updates when data changes
- Proper cache hydration for future visits
- Consistent with relay list fetching pattern

**Technical:**
- Imported and integrated blossomServerCache service
- Added cache check before network fetch
- Separated EventStore subscription from network fetch
- Added cache updates on event arrival

---------

Co-authored-by: Claude <noreply@anthropic.com>

src/core/logic.ts

@@ -295,6 +295,31 @@ export const setActiveAccountRelays = (
   };
 };
 
+/**
+ * Updates the blossom server list for the active account.
+ */
+export const setActiveAccountBlossomServers = (
+  state: GrimoireState,
+  blossomServers: string[],
+): GrimoireState => {
+  if (!state.activeAccount) {
+    return state;
+  }
+
+  // If blossom servers reference hasn't changed, return state unchanged
+  if (state.activeAccount.blossomServers === blossomServers) {
+    return state;
+  }
+
+  return {
+    ...state,
+    activeAccount: {
+      ...state.activeAccount,
+      blossomServers,
+    },
+  };
+};
+
 /**
  * Deletes a workspace by ID.
  * Cannot delete the last remaining workspace.

src/core/state.ts

@@ -275,6 +275,15 @@ export const useGrimoire = () => {
     [setState],
   );
 
+  const setActiveAccountBlossomServers = useCallback(
+    (blossomServers: string[]) => {
+      setState((prev) =>
+        Logic.setActiveAccountBlossomServers(prev, blossomServers),
+      );
+    },
+    [setState],
+  );
+
   const updateLayoutConfig = useCallback(
     (layoutConfig: Partial<LayoutConfig>) => {
       setState((prev) => Logic.updateLayoutConfig(prev, layoutConfig));
@@ -351,6 +360,7 @@ export const useGrimoire = () => {
     setActiveWorkspace,
     setActiveAccount,
     setActiveAccountRelays,
+    setActiveAccountBlossomServers,
     updateLayoutConfig,
     applyPresetLayout,
     updateWorkspaceLabel,