docs: bump changelog v0.4.9

docs/docs/releases/changelog/changelog-v0.4.9.mdx

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+---
+sidebar_position: 1
+slug: /changelog/changelog-v0.4.9
+---
+# v0.4.9
+
+For more details, [GitHub Issues](https://github.com/janhq/jan/releases/tag/v0.4.9)
+
+Highlighted Issue:  [Issue #2421: Release/v0.4.9](https://github.com/janhq/jan/pull/2421)
+
+## Changes
+
+- Release/v0.4.9 @namchuai (#2421)
+- Release cut 0.4.9 @louis-jan (#2398)
+- Update models.json @louis-jan (#2382)
+- docs: add about/faq @eckartal (#2329)
+- Update docs 14th mar @dan-jan (#2362)
+- feat: Nitro-Tensorrt-LLM Extension @louis-jan (#2280)
+- Sync release 0.4.8 to dev @louis-jan (#2297)
+
+## 🚀 Features
+
+- feat: quick ask support dark mode @urmauur (#2316)
+
+## 🐛 Fixes
+
+- fix: move tensorrt executable to engine @namchuai (#2400)
+- fix: unable to start web with quick ask @namchuai (#2402)
+- fix: fail-fast would cancel matrix jobs as soon as one job fails @louis-jan (#2401)
+- fix: clean working dir with long space support on Windows @louis-jan (#2399)
+- fix: line height typography blog and docs @urmauur (#2390)
+- fix: some regressions for tensorrt nightly build @namchuai (#2380)
+- fix: use model from model hub not load correct model in thread screen @namchuai (#2368)
+- fix: wrong engine handling @louis-jan (#2363)
+- fix: incompatible GPU error message @louis-jan (#2357)
+- fix: app does not recognize GPU first launch @louis-jan (#2350)
+- fix: disable rag \& stream settings from tensorrt llm model.json @louis-jan (#2351)
+- fix: badge or progress tensorRtExtensionItem @urmauur (#2349)
+- fix: ts error when declar var in case @namchuai (#2348)
+- fix: some costmetic issues: badges corner, recommended for tensorrt models @namchuai (#2346)
+- Add icon file contain image size in file name to fix linux icon @hiento09 (#2344)
+- fix: put quick ask feature toggle under experimental feature @louis-jan (#2338)
+- fix: do not migrate extensions from quick ask window @louis-jan (#2336)
+- fix: existing changelog @hieu-jan (#2330)
+- fix: gate quick ask with feature toggle @louis-jan (#2331)
+- fix: quick app windows, tray and dock behaviors @louis-jan (#2327)
+- fix: jan app tray blocks app update @louis-jan (#2319)
+- fix: quick ask not show @louis-jan (#2315)
+- fix: quick ask blocks app update @louis-jan (#2310)
+- fix: message from quick ask not get the selected model @namchuai (#2307)
+- fix: replace robotjs by nutjs (#2295) @louis-jan (#2302)
+
+## 🧰 Maintenance
+
+- docs: Update sidebar and content for http proxy and import model @aindrajaya (#2328)
+- chore: temporary remove linux from tensorrt support @namchuai (#2386)
+- docs: Update broken-build.mdx @0xSage (#2385)
+- docs: sync updated content to main page @hieu-jan (#2384)
+- docs: fix broken link by redirecting to the right paths @aindrajaya (#2381)
+- docs: api reference 2.0 @aindrajaya (#2367)
+- docs: bump changelog v0.4.8 @hieu-jan (#2366)
+- docs: trt-llm extension guides @0xSage (#2353)
+- docs: enhance autogenerate changelog configuration @hieu-jan (#2289)
+- docs: update website-docs content @hieu-jan (#2287)
+- docs: update slogan @hieu-jan (#2282)
+- docs: sync updated content from dev to docs branch @hieu-jan (#2283)
+- docs: Fix install slug and fix navbar style in darkmode @aindrajaya (#2306)
+
+## Contributor
+
+@0xSage, @aindrajaya, @dan-jan, @eckartal, @hiento09, @hieu-jan, @jan-service-account, @louis-jan, @namchuai and @urmauur
+