feat: add Portfolio button to BTC accounts

[jonybur]

Description

Readds the "Portfolio" button for non-EVM accounts

Related issues

Fixes: #26148 #28185

Manual testing steps

1. Go to the Wallet page
2. Switch to a BTC account
3. The Portfolio button should be there

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[seaona]

I see the issue fixed, thank you

flask-btc-portfolio.mp4

[metamaskbot]

Builds ready [5107e66]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6
  • common: 0, 1, 10, 11, 2, 3, 4, 5, 6, 7, 8, 9
  • content-script: 0
  • offscreen: 0
  • ui: 0, 1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (2070 ± 85 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	817	2459	1980	309	148
		domContentLoaded	1717	2436	2033	178	85
		load	1779	2462	2070	176	85
		domInteractive	20	215	61	42	20
		backgroundConnect	9	78	31	24	12
		firstReactRender	60	166	104	22	11
		getState	6	63	26	22	11
		initialActions	0	1	0	0	0
		loadScripts	1261	1929	1529	163	78
		setupStore	12	73	30	24	11
		uiStartup	1948	2685	2292	180	86

Bundle size diffs

• background: 0 Bytes (0.00%)
• ui: -264 Bytes (-0.00%)
• common: 0 Bytes (0.00%)