feat(theme): update Hanmac Green and Brown palette steps

Seven shared Hanmac color tokens change:
- Green Default #123328 -> #164434, Dark 1 #0a221d -> #11372d,
  Dark 2 #071e18 -> #0b2b23, Dark 3 #020a07 -> #030e0a
- Brown Default #3e3523 -> #4e422d, Dark 1 #352d1d -> #403726,
  Dark 3 #1d1810 -> #0d0b07

Updates primitives.css, the generated default values, themes/default.json,
the verification baseline and the hard-coded Default expectations in the
theme Stories and the quality-reference script. --hm-sem-on-accent is
intentionally unchanged. check:theme-defaults reports generated outputs match.

src/theme/designer-theme.stories.tsx

@@ -240,7 +240,7 @@ export const LiveVerification: Story = {
       }
       fillJson('{"schemaVersion":1,"tokens":{"color.state.active":"#345678"}}'); click("Import JSON")
       await waitForThemeState(() => variable("--hm-sem-state-active") === "#345678", "Designer partial import")
-      assert(variable("--hm-sem-state-active") === "#345678" && variable("--hm-sem-action-primary") === "#123328" && variable("--hm-sem-stroke-input-focus") === "#266651", "Partial import replaces previous keys; unspecified roles use Default")
+      assert(variable("--hm-sem-state-active") === "#345678" && variable("--hm-sem-action-primary") === "#164434" && variable("--hm-sem-stroke-input-focus") === "#266651", "Partial import replaces previous keys; unspecified roles use Default")
       for (const [index, [token, label]] of roles.entries()) {
         const value = `#3456${(120 + index).toString(16)}`
         setInput(`${label} HEX`, value)