[ci] Suppress typecheck on the ui-wails embed instead of skipping main.go

The previous attempt added client/ui-wails/main.go to the file path
exclude list, but golangci-lint v2's path filter only suppresses
issues from rule-based linters; the typecheck pre-pass that compiles
the package still runs and fails with "pattern all:frontend/dist: no
matching files found" before any rule fires.

Replace the path-level skip with a targeted exclusions.rules entry
that matches just that diagnostic on just that file. The rest of
client/ui-wails (services/, tray.go, grpc.go, ...) keeps being linted
normally.

Validated locally by deleting frontend/dist and running
`golangci-lint run client/ui-wails/...` — 0 issues with this config.

.golangci.yaml

@@ -114,16 +114,20 @@ linters:
       - linters:
           - staticcheck
         text: "QF1012"
+      # client/ui-wails/main.go uses //go:embed all:frontend/dist; the
+      # directory is populated by `pnpm build` in the release pipeline
+      # and missing at lint time, so the embed parses to "no matching
+      # files found" — surfaced by golangci-lint's typecheck pre-pass.
+      # Suppress just that one diagnostic; the rest of the package
+      # (services/, tray.go, grpc.go, ...) still gets linted normally.
+      - linters:
+          - typecheck
+        path: client/ui-wails/main\.go
+        text: "pattern all:frontend/dist"
     paths:
       - third_party$
       - builtin$
       - examples$
-      # client/ui-wails/main.go uses //go:embed all:frontend/dist; that
-      # directory is populated by `pnpm build` in the release pipeline
-      # and is missing at lint time, so the typecheck phase fails before
-      # any rule runs. Skip just main.go — the rest of the package
-      # (services/, tray.go, grpc.go, ...) still gets linted.
-      - client/ui-wails/main\.go$
 issues:
   max-same-issues: 5
 formatters: