simplify language selector display to use text-only labels

Replace icon-based language options with plain text labels in both the
header dropdown and preferences settings to keep the UI clean and
avoid potential controversies. Remove unused country-flag-icons dependency.

web/bun.lock

@@ -1,6 +1,5 @@
 {
   "lockfileVersion": 1,
-  "configVersion": 0,
   "workspaces": {
     "": {
       "name": "react-template",
@@ -13,7 +12,6 @@
         "@visactor/vchart-semi-theme": "~1.8.8",
         "axios": "1.12.0",
         "clsx": "^2.1.1",
-        "country-flag-icons": "^1.5.19",
         "dayjs": "^1.11.11",
         "history": "^5.3.0",
         "i18next": "^23.16.8",
@@ -884,8 +882,6 @@
 
     "cosmiconfig": ["cosmiconfig@7.1.0", "", { "dependencies": { "@types/parse-json": "^4.0.0", "import-fresh": "^3.2.1", "parse-json": "^5.0.0", "path-type": "^4.0.0", "yaml": "^1.10.0" } }, "sha512-AdmX6xUzdNASswsFtmwSt7Vj8po9IuqXm0UXz7QKPuEUmPB4XyjGfaAr2PSuELMwkRMVH1EpIkX5bTZGRB3eCA=="],
 
-    "country-flag-icons": ["country-flag-icons@1.5.19", "", {}, "sha512-D/ZkRyj+ywJC6b2IrAN3/tpbReMUqmuRLlcKFoY/o0+EPQN9Ev/e8tV+D3+9scvu/tarxwLErNwS73C3yzxs/g=="],
-
     "cross-spawn": ["cross-spawn@7.0.6", "", { "dependencies": { "path-key": "^3.1.0", "shebang-command": "^2.0.0", "which": "^2.0.1" } }, "sha512-uV2QOWP2nWzsy2aMp8aRibhi9dlzF5Hgh5SHaB9OiTGEyDTiJJyx0uy51QXdyWbtAHNua4XJzUKca3OzKUd3vA=="],
 
     "cssesc": ["cssesc@3.0.0", "", { "bin": { "cssesc": "bin/cssesc" } }, "sha512-/Tb/JcjK111nNScGob5MNtsntNM1aCNUDipB/TkwZFhyDrrE47SOx/18wF2bbjgc3ZzCSKW1T5nt5EbFoAz/Vg=="],