#5870 fix(desktop): remove browser pane tooltips and restyle pane/preset tooltips

Summary

• Remove tooltips from the browser pane's back, forward, and reload buttons (both the v1 and v2 workspace copies of BrowserToolbar)
• Remove the close-pane tooltip from the shared pane header actions: v1 PaneToolbarActions and v2 useDefaultPaneActions (made tooltip optional in @superset/panes PaneActionConfig and render a plain button when absent)
• Drop the now-dead closeHotkeyId prop from PaneToolbarActions and its five call sites
• Restyle the "Manage Presets" and split-pane tooltips to the subtle hotkey-chip style (bordered bg-background, no arrow) with a 1s hover delay, matching the preset-item HotkeyTooltips

Test Plan

• bun run lint passes
• turbo typecheck passes for @superset/desktop and @superset/panes
• Hover browser back/forward/reload and close-pane buttons — no tooltips
• Hover the presets cog and split-pane buttons — chip-style tooltip appears after ~1s

https://claude.ai/code/session_01CxPkcBBWZeaNygsF9dwMCH

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Summary by cubic

Removed tooltips from browser pane navigation and close actions, and restyled split-pane and “Manage Presets” tooltips to a subtle hotkey-chip style with a 1s hover delay.

• Refactors
  • Made tooltip optional in @superset/panes PaneActionConfig and render a plain button when absent.
  • Removed closeHotkeyId from desktop PaneToolbarActions and all call sites.

Summary by CodeRabbit

• UI Improvements
  • Updated preset and pane-action tooltips with a consistent appearance, positioning, and one-second delay.
  • Removed tooltips from browser navigation and reload controls for a cleaner toolbar.
  • Removed close-pane hotkey hints from pane controls while preserving close functionality.
  • Improved toolbar behavior for actions without tooltips, preventing unnecessary tooltip containers.