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>

README.md

@@ -2,7 +2,7 @@
 
 A self-hosted, full-stack network management platform for MikroTik devices. Monitor, configure, and manage your entire MikroTik infrastructure — routers, switches, and wireless access points — from a single web interface.
 
-![Version](https://img.shields.io/badge/version-0.14.0_Beta-blue)
+![Version](https://img.shields.io/badge/version-0.14.1_Beta-blue)
 ![License](https://img.shields.io/badge/license-AGPLv3-blue)
 ![Docker](https://img.shields.io/badge/docker-compose-2496ED?logo=docker&logoColor=white)
 ![TypeScript](https://img.shields.io/badge/TypeScript-5.3-3178C6?logo=typescript&logoColor=white)