perf(refactor): consolidate getState calls in resolveWebviewView

[0xMink]

Summary

• Consolidate three separate this.getState().then(...) calls into a single await this.getState() with destructuring in resolveWebviewView()
• Eliminates two redundant executions of getState() which includes CloudService calls, ContextProxy reads, and other work
• Uses a single snapshot, avoiding potential inconsistency if settings change mid-resolution
• No behavioral change — same defaults, same setter calls, same values

Closes: #11319

Test plan

• Existing ClineProvider.spec.ts tests pass (90/90, 6 skipped unchanged)
• Verify terminal settings (shell integration timeout, command delay, zsh options) are applied correctly on webview load
• Verify TTS enabled/speed settings are applied correctly on webview load

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Important

Refactor resolveWebviewView in ClineProvider.ts to consolidate multiple getState calls into a single call, improving performance and consistency without changing behavior.

• Refactor:
  • Consolidate three this.getState().then(...) calls into a single await this.getState() in resolveWebviewView() in ClineProvider.ts.
  • Use destructuring to extract state values in one go, reducing redundant getState() executions.
  • Maintain same defaults, setter calls, and values, ensuring no behavioral change.
• Performance:
  • Eliminates redundant CloudService calls and ContextProxy reads by using a single state snapshot.
  • Avoids potential inconsistencies if settings change during multiple getState() calls.

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[roomote]

Rooviewer   See task

Clean refactor, no issues found. The consolidation from three fire-and-forget getState().then(...) calls into a single await this.getState() is correct -- defaults match, all setters are preserved, and the blocking await is actually an improvement since it guarantees settings are applied before the webview finishes setup.

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