fix: show "Exchange" label instead of "Wallet" when exchange is selected in pay loading view

[devin-ai-integration]

Description

When a payment is made through an exchange (e.g., Binance), the "Processing payment..." screen previously always displayed "Wallet" as the label, even when the connected entity is an exchange. This PR conditionally renders "Exchange" when selectedExchange is set, and "Wallet" otherwise.

Change: In w3m-pay-loading-view, the hardcoded "Wallet" text in renderWallet() is replaced with ${this.selectedExchange ? 'Exchange' : 'Wallet'}.

The existing test for exchange display is extended to assert that the "Exchange" label appears and "Wallet" does not.

Type of change

• Chore (non-breaking change that addresses non-functional tasks, maintenance, or code quality improvements)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Human Review Checklist

• Verify there are no other views (e.g., w3m-pay-quote-view) where a similar "Wallet" → "Exchange" label change is also needed
• Visually confirm the label renders correctly for both exchange and non-exchange payment flows on the preview link

Associated Issues

N/A

Checklist

• Code in this PR is covered by automated tests (Unit tests, E2E tests)
• My changes generate no new warnings
• I have reviewed my own code
• I have filled out all required sections
• I have tested my changes on the preview link
• Approver of this PR confirms that the changes are tested on the preview link

---

Link to Devin run: https://app.devin.ai/sessions/11056cf8bd344e0780b9650ee4a54e5f
Requested by: @magiziz

[devin-ai-integration]

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Visual Regression Test Results ✅ Passed

⚠️ 15 visual change(s) detected

Chromatic Build: https://www.chromatic.com/build?appId=6493191bf4b10fed8ca7353f&number=747
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👉 Please review the visual changes in Chromatic and accept or reject them.

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Size:         75.4 kB with all dependencies, minified and gzipped
Loading time: 1.5 s   on slow 3G
Running time: 217 ms  on Snapdragon 410
Total time:   1.7 s
@reown/appkit/react
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Size:         233.51 kB with all dependencies, minified and gzipped
Loading time: 4.6 s     on slow 3G
Running time: 489 ms    on Snapdragon 410
Total time:   5.1 s
@reown/appkit/vue
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Size:         75.4 kB with all dependencies, minified and gzipped
Loading time: 1.5 s   on slow 3G
Running time: 235 ms  on Snapdragon 410
Total time:   1.8 s
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Size limit:   220 kB
Size:         213.41 kB with all dependencies, minified and gzipped
Loading time: 4.2 s     on slow 3G
Running time: 357 ms    on Snapdragon 410
Total time:   4.6 s
@reown/appkit-ui
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Size:         13.16 kB with all dependencies, minified and gzipped
Loading time: 258 ms   on slow 3G
Running time: 85 ms    on Snapdragon 410
Total time:   342 ms

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Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	78.66%	39488 / 50199
🔵	Statements	78.66%	39488 / 50199
🔵	Functions	76.34%	4250 / 5567
🔵	Branches	86.73%	9615 / 11085

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
packages/pay/src/ui/w3m-pay-loading-view/index.ts	87.45%	91.91%	100%	87.45%	400, 430-431, 433-434, 458-462, 467-471, 476-480, 99-384

Generated in workflow #16850 for commit 1e96c71 by the Vitest Coverage Report Action