feat(ui): theme-aware logo, dashboard bar graph, server-side client sorting (v0.14.1-beta)

UI/UX refinements on top of v0.14.0-beta, all validated on the test server:

- Logo: new theme-aware compass iconmark (light/dark SVGs swapped via the
  dark class), sized to 45px; favicon updated to match. Wordmark casing
  corrected to "MikroTik Manager" (font size unchanged).
- Navigation icons enlarged 15 -> 17px.
- Dashboard: "Connected clients" line chart converted to a bar chart with a
  category axis + light downsampling so bars stay readably thick across ranges.
- Clients: sorting is now server-side across the whole dataset (was sorting
  only the current page, so Type/others appeared to do nothing on a uniform
  page); table uses a fixed column layout + keepPreviousData so columns no
  longer jump or blank out when sorting/paging. Backend clients route gains
  whitelisted sort/dir params (safe numeric IP sort, deterministic tiebreaker).
- Connections tab: surfaces the live /ip/firewall/connection/tracking state
  (on/auto/off pill) and clearer empty-state copy explaining auto-mode.

Lint/typecheck/build/jest green in both workspaces; npm audit --audit-level=high
clean.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "mikrotik-manager-backend",
-  "version": "0.14.0-beta",
+  "version": "0.14.1-beta",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "mikrotik-manager-backend",
-      "version": "0.14.0-beta",
+      "version": "0.14.1-beta",
       "dependencies": {
         "@influxdata/influxdb-client": "^1.33.2",
         "@influxdata/influxdb-client-apis": "^1.35.0",