Fix macOS-only copy on two Windows FMA catalog entries (#50111)

<!-- Add the related story/sub-task/bug number, like Resolves #123, or
remove if NA -->
**Related issue:** N/A — found while removing the macOS Yubikey Manager
FMA (#50109)

Two Windows Fleet-maintained apps describe themselves as macOS software
in `ee/maintained-apps/outputs/apps.json`, because the entries were
copy-pasted from their macOS counterparts. This copy is customer-facing:
it shows in the Fleet UI's software catalog and on
`fleetdm.com/software-catalog/<slug>`.

- `proxyman/windows` — "Proxyman is a high-performance **macOS** app
that enables developers to view HTTP/HTTPS requests and responses." →
drops "macOS". (The `proxyman/darwin` description keeps it; it's
accurate there.)
- `wechat/windows` — name "**WeChat for Mac**" and "**WeChat for Mac**
is a free messaging and calling application." → "WeChat". The winget
input (`inputs/winget/wechat.json`) already declares `"name": "WeChat"`,
so this also makes `apps.json` agree with its own input. The
`wechat/darwin` entry keeps "WeChat for Mac", which is the actual macOS
product name.

Renaming the Windows entry needs a matching icon key.
`getMatchedSoftwareIcon` matches on the lowercased app name and requires
an exact match or a whole-word prefix (`matchLoosePrefixToKey`: `s ===
key || s.startsWith(key + " ")`), so the existing `"wechat for mac"` key
would **not** match a name of "WeChat" and the app would fall back to
the generic package icon. Added a `wechat: Wechat` key alongside it
(both point at the same component; the `"wechat for mac"` key stays for
macOS and for hosts reporting that name in inventory).

No server-side impact: `UpsertMaintainedApp` keys on `slug` and updates
`name` in place, and `ReconcileMaintainedAppSoftwareNames` only renames
`darwin` titles, so the Windows rename doesn't touch existing software
titles. Website icons resolve from the slug (`build-static-content.js`
builds `app-icon-<slug>-60x60@2x.png`), not the name, so
`app-icon-wechat-60x60@2x.png` is unaffected.

Descriptions here mirror upstream cask/winget copy, so these are minimal
factual corrections rather than a voice rewrite.

# Checklist for submitter

- [x] Input data is properly validated, `SELECT *` is avoided, SQL
injection is prevented (using placeholders for values in statements), JS
inline code is prevented especially for url redirects, and untrusted
data interpolated into shell scripts/commands is validated against shell
metacharacters.

## Testing

- [x] QA'd all new/changed functionality manually:
- `apps.json` still parses; 1378 apps; verified the four
`proxyman`/`wechat` entries read as intended and the `darwin` ones are
untouched.
- Traced the icon lookup by hand: name "wechat" now hits the new
exact-match key; "wechat for mac" still hits the original.
- Swept every non-darwin entry in `apps.json` for macOS-only phrasing
(`Rosetta`, `macOS`, `Mac`, `Apple`) — these two were the only genuine
mismatches. `duo-desktop/windows` (lists macOS, Windows, and Linux) and
`imazing-profile-editor/windows` (edits Apple configuration profiles)
are correct as written.

Note: `node_modules` isn't installed in my working copy, so
ESLint/Prettier weren't run locally — the added line is a one-line map
entry matching the surrounding style. CI will confirm.

ee/maintained-apps/outputs/apps.json

@@ -6915,7 +6915,7 @@
       "slug": "proxyman/windows",
       "platform": "windows",
       "unique_identifier": "Proxyman",
-      "description": "Proxyman is a high-performance macOS app that enables developers to view HTTP/HTTPS requests and responses."
+      "description": "Proxyman is a high-performance app that enables developers to view HTTP/HTTPS requests and responses."
     },
     {
       "name": "Pulsar",
@@ -9165,11 +9165,11 @@
       "description": "WeChat for Mac is a free messaging and calling application."
     },
     {
-      "name": "WeChat for Mac",
+      "name": "WeChat",
       "slug": "wechat/windows",
       "platform": "windows",
       "unique_identifier": "WeChat",
-      "description": "WeChat for Mac is a free messaging and calling application."
+      "description": "WeChat is a free messaging and calling application."
     },
     {
       "name": "WeekToDo",

frontend/pages/SoftwarePage/components/icons/index.ts

@@ -2228,6 +2228,7 @@ export const SOFTWARE_NAME_TO_ICON_MAP = {
   webcatalog: Webcatalog,
   webex: Webex,
   webstorm: WebStorm,
+  wechat: Wechat,
   "wechat for mac": Wechat,
   weektodo: Weektodo,
   whatroute: Whatroute,